This study reports outcomes of the first prospective internationa

This study reports outcomes of the first prospective international multicenter trial and compares them to a retroscpective cohort of patients after laparoscopic Heller Myotomy (LHM). The primary outcome was symptom relief at 3 months defined as an Eckhardt score of ≤3. Secondary outcomes were procedure-related adverse events, lower esophageal sphincter pressure (LESP), and presence of gastro-esophageal reflux. Outcomes were compared to a retrospective analysis of a pooled multi-center surgical control group

including 110 cases. We attempted to obtain data for the surgical group as close to the 3-month follow-up as possible. Seventy patients (43% female, mean age 45 years) with symptomatic primary achalasia underwent POEM at 5 centers in Europe and North America. POEM was successfully performed in all patients with a mean operative time of 105 minutes Selleckchem Anti-infection Compound Library (range 54-240). There were no conversions to laparoscopic or open surgery. Data for the primary endpoint was available for all patients. Treatment success (Eckhardt score HDAC activity assay ≤3) was achieved in 97% (95% CI: 89%-99%)

of patients (mean Eckhardt score pre vs. post treatment: 7 vs. 1; p<0.001). Mean LESP was 28 mmHg pre-treatment and 9 mmHg post treatment (p<0.001). Compared to the retrospective LHM group, POEM patients had lower 3 month Eckhardt scores (1 vs. 1.4, p=0.05) and significantly lower postoperative LESP (9 vs. 12 mmHg, p=0.01). A detailed comparison of outcomes between POEM and LHM is provided in Table 1. The presence of esophagitis was higher in the POEM group, but differences were not statistically significantly (41% vs. 28%, p=0.21) Table 2.

POEM is an effective treatment for achalasia with short-term symptom relief in more than 90% of cases, equivalent to LHM. Prospective randomized trials are warranted. Table 1. Outcome comparison POEM versus LHM “
“A randomized in vivo porcine model study (1) and a pilot clinical study (2) demonstrated that submucosal injection of a thiol compound, so called mesna, chemically softened connective tissues and facilitated the submucosal dissection process (SD) in ESD. This study was a double blinded randomized placebo-controlled trial to evaluate if the mesna injection would hasten the procedural time of gastric ESD. A total of 101 DNA ligase patients with 106 gastric superficial lesions indicated for ESD were enrolled and randomly assigned to the mesna or control (saline) group. Traditional ESD was performed by three experts for all enrolled patients using a tip insulated needle knife with single bolus injection of mesna or saline under an isolated diseased mucosa following circumferential mucosal incision assisted with hyaluronate submucosal injection in a standard manner. Primary outcome measure was time for SD (TSD). Outcomes of 53 lesions in the mesna group and 52 lesions in the control group with histologic confirmation of neoplastic lesions in sampled specimens were analyzed.

For other patients, actively involving partners in the rehabilita

For other patients, actively involving partners in the rehabilitation process to encourage and motivate the patient may help (Fekete et al., 2006). Envisaging a greater number of barriers to participating

in exercise predicted non-adherence with treatment (Sluijs et al., 1993 and Alexandre et al., 2002). Barriers included transportation problems, child care needs, work schedules, lack of time, family dependents, financial constraints, convenience and forgetting. Physiotherapists need to be aware of difficulties that patients foresee in relation to adhering with a proposed treatment plan and act collaboratively Baf-A1 with their patients to design treatment plans which are customised to the patient’s life circumstances (Turk and Rudy, 1991). The addition of coping plans may help patients to overcome difficulties that may arise and allow them

to maintain the treatment programme (Gohner and Schlicht, 2006 and Ziegelmann et al., 2006). There was limited evidence for many barriers and a lack of research into other potential predictors, e.g. socioeconomic status and the barriers introduced by health selleck products professionals or health organisations. Adherence has been identified as a priority in physiotherapy research (Taylor et al., 2004) therefore further high quality research is required in order to investigate the predictive validity of these barriers within musculoskeletal settings. Poor attendance at clinic appointments is an objective measure with quantifiable cost implications to the health service. The extent to which patients actually carry out a programme of exercises recommended by a physiotherapist is an important research question which is methodologically

more difficult to answer. These two different aspects of adherence may be related to different barriers and may require different IMP dehydrogenase strategies to overcome them, therefore these different aspects of adherence may be better addressed individually. This review identified 20 studies investigating barriers which predicted non-adherence with musculoskeletal treatment. Strong evidence was found that low levels of physical activity at baseline or in previous weeks, low in-treatment adherence with exercise, low self-efficacy, depression, anxiety, helplessness, poor social support or activity, greater perceived number of barriers to exercise and increased pain levels during exercise are all barriers to treatment adherence. Identification of these barriers during patient assessments may be important in order to adopt appropriate management strategies which help to counteract their effects and improve treatment outcome.

This reported the good staging accuracy of PCR (i e SE and SP ab

This reported the good staging accuracy of PCR (i.e. SE and SP above 80%), but limited utility during post-therapeutic follow-up (specificity and sensitivity varied between 50% and 80%) [57]. These selleck results confirmed previously published data on the strong potential of PCR compared

to other approaches for stage determination, including LATEX/IgM and WBC count, if the presence of parasites in CSF was considered as the only gold standard [113]. However, it is well known that the detection of parasites in CSF is not sensitive enough to be used as a unique staging method. Further studies are needed to evaluate the real added value of PCR compared to the standard stage determination tools. Another aspect that should be taken into account is the low utility of PCR during the post-therapeutic follow-up, since positive results are obtained from patients considered cured [57]. As already highlighted for diagnosis, the application selleck chemical of standard PCR methods in the field is not

practicable. The detection of parasites through amplification of specific DNA sequences in CSF using the LAMP approach is a promising alternative for field application and interesting preliminary results have been reported [114]. An alternative method for easier WBC counts has also been proposed. Based on the observation of the presence of a high number of B-cells expressing CD19 in the CSF of S2 patients, the proposed method consisted Pyruvate dehydrogenase in counting this B-cell population through the formation of rosettes that can be easily visualized and counted by microscopy [115] and [116]. All the biomarkers and tools for the stage determination of HAT described in the previous paragraphs derived from current knowledge of the mechanisms and manifestations of the disease’s progression. However, one of the most common approaches for the discovery of disease biomarkers is the systematic evaluation

of the changes in protein expression between healthy and pathological conditions. As already highlighted, the application of proteomics on sleeping sickness at the host level is an unexplored field. Only one study has been published so far comparing the CSF proteome of S1 and S2 HAT patients [117]. By applying complementary proteomics discovery approaches, it has been shown that a number of host proteins were over-expressed in the CSF of S2 patients. Not surprisingly the 2-DE proteome maps of S2 patients showed a huge increase in the amount of immunoglobulins, in accord with previous knowledge of an elevation of immunoglobulins in CSF with disease progression [85]. Two of the 73 differentially expressed proteins, beta-2-microglobulin and osteopontin, were further confirmed to be accurate discriminators of S1 and S2 patients (AUC% = 91.5 and 84.8, respectively) [117], however after verification other proteins on the list may be found to be more useful.

Urine was collected over a twenty-four hour period after the last

Urine was collected over a twenty-four hour period after the last administration of either eldecalcitol or vehicle. Rats were perfused through the left ventricle with 4% paraformaldehyde diluted in 0.1 M phosphate buffer (pH 7.4) under anesthesia with an intraperitoneal injection of chloral hydrate, and had their femora and tibiae extracted, decalcified and embedded in paraffin as previously described [28]. Four μm-thick sections

were cut and stained with HE for histological analysis. Specimens were observed under a Nikon Eclipse E800 microscope (Nikon Instruments Inc. Tokyo, Japan). Light microscopic images were acquired with a digital camera (Nikon DXM1200C, Birinapant Nikon). For transmission electron microscopy (TEM), fixed specimens were decalcified, post-fixed with OsO4, dehydrated, and embedded in epoxy resin (Epon 812, Taab, Berkshire, UK) as previously described [28]. Semi- and ultrathin-sections were observed under light microscopy or under a TEM (Hitachi H-7100, Hitachi Co., Tokyo, Mcl-1 apoptosis Japan) at 80 kV. Femoral bone mineral density (BMD) was measured by dual-energy X-ray absorptiometry (DXA: DCS-600EX, Aloka, Tokyo, Japan). Results are shown in milligrams per square centimeter. Urinary creatinine (Cre) concentrations were measured with an automatic analyzer (7170, Hitachi, Tokyo, Japan). Urinary deoxypylidinoline (DPD) concentration

was measured using a Metra DPD EIA kit (Quidel Corporation, San Diego, CA). Data were corrected for urinary Cre concentration, and results are expressed in nmol/mmol. Dewaxed paraffin sections were treated for endogenous peroxidase Phospholipase D1 inhibition with 0.3% H2O2 in phosphate buffered saline (PBS) for 20 min and nonspecific staining blocking with 1% bovine serum albumin in PBS (1% BSA-PBS) for 30 min at room temperature (RT). Sections were incubated with 1) rabbit antisera against tissue nonspecific alkaline phosphatase (ALP) [28] and [29],

2) mouse anti-rat ED1 (AbD Serotec, Oxford, UK), and 3) rabbit anti-cathepsin K (Daiichi Fine Chemical Co., Ltd., Toyama, Japan) for 2 h at RT, and then, incubated with horseradish peroxidase (HRP)-conjugated anti-rabbit or anti-mouse secondary antibodies (R&D System Inc., Minneapolis, MN) for 1 h at RT. Immunoreactions were detected with 3,3′-diaminobenzidine tetrahydrochloride (DAB, Dojindo Laboratories, Kumamoto, Japan). A sequential approach was employed for the cathepsin K/ED1 double immunostaining procedure. Cathepsin K immunohistochemistry was performed as described above. ED-1 immunoreactivity was detected as described, only with goat ALP-conjugated anti-mouse IgG (Sigma) as the second antibody and with a visualization procedure described previously [30]. For double detection of ALP/PCNA, immunostaining using anti-mouse PCNA (Oncogene Research products, San Diego, CA) was conducted, and a HRP-conjugated second antibody was used to allow for visualization.

The experiment was run on a personal computer (Pentium 4) with a

The experiment was run on a personal computer (Pentium 4) with a QWERTY keyboard. Stimulus presentation, response registration and production of external triggers were controlled by E-Prime, version 1.1. A 17 in. monitor was placed in front of the participants at a distance of about 45 cm. EEG and electro-oculogram (EOG) were amplified with a Quick-Amp amplifier (72 channels, DC) and recorded with Brain Vision Recorder

(version 1.05) software. EEG was recorded from 61 Ag/AgCl ring electrodes located at standard electrode positions of the extended 10/20 system. An online average reference was employed. EOG was recorded bipolarly, both vertically from above and below the left eye and horizontally from the outer canthi of both eyes. Electrode impedance was kept below 5 kΩ. The EEG INCB024360 and EOG data were sampled

at a rate of 500 Hz. Measured activity was digitally filtered online (low-pass 140 Hz, DC). For statistical analyses, Greenhouse–Geisser epsilon correction for the degrees of freedom was applied whenever appropriate. One participant was left out from the final analyses because of the large number of errors (61% correct keypresses, while all other participants had a percentage of correct keypresses of 85% or higher), which suggested that this participant did not fully comply Osimertinib clinical trial with the task instructions. Furthermore, EEG analyses were performed on all data without artifacts, because elimination of all trials with a single incorrect response would unnecessarily reduce the total number of EEG trials and might additionally introduce a bias for familiar vs.

unfamiliar sequences. The interval between the off-set of the last stimulus and the go/nogo signal was 1500 ms. The data was segmented starting 1600 ms before the go/nogo signal until 100 ms after the go/nogo signal. A baseline was set 1600–1500 ms before the go/nogo signal. The last stimulus remained present on the screen until the end of the baseline. Trials with artifacts (an amplitude difference larger than 100 μV Vorinostat within 50 ms) and out of range values (values larger than +/− 250 μV for prefrontal electrodes, +/− 200 μV for frontal electrodes, +/− 150 μV for central electrodes, and +/− 100 μV for parietal electrodes) were excluded from further analyses (comparable to Van der Lubbe, Neggers, Verleger, & Kenemans, 2006). Next, EEG was corrected for EOG artifacts by the Gratton, Coles, and Donchin (1983) procedure. Finally, a low-pass filter with a cut-off at 16 Hz was applied to average event-related brain potentials of individual participants. Response time (RT) was defined as the time between onset of the go-signal and depression of the first key and as the time between the onsets of two consecutive key presses within a sequence. The stimulus–response interval was always 0 ms. The first two trials of every block and after every break and trials with errors were excluded from RT analyses.

, 2009, Nemoto et al , 2000, Campbell and Febbraio, 2001 and Fory

, 2009, Nemoto et al., 2000, Campbell and Febbraio, 2001 and Foryst-Ludwig and Kintscher, selleck screening library 2010). It has been observed that certain drugs can precipitate

or exacerbate steatosis and steatohepatitis by accentuating the predisposing factors, including those factors associated with estrogen deficiency (Farrel, 2002 and Mu et al., 2009). The steatotic phenotype of PPARα (peroxisome proliferator-activated receptor)-null mice, for example, is exacerbated by etomoxir, which abolishes lipid oxidation by inhibiting long-chain fatty acid transport into the mitochondria (Djouadi et al., 1998, Farrel, 2002 and Mu et al., 2009). Tamoxifen (TAM), the most well-known SERM, acts as an inhibitor of fatty acid β-oxidation and

oxidative phosphorylation (Berson et al., 1998 and Tuquet et al., 2000) and it has demonstrated to induce steatosis, steatohepatitis and cirrhosis in some women during the treatment of breast cancer (Oien et al., 1999 and Pratt et al., 1995). Raloxifen, on the other hand, is used in the menopausal period, in which there is an increased prevalence of lipid metabolism disturbances Vincristine price (Hewit et al., 2004 and Mu et al., 2009). Nevertheless, few studies have been conducted concerning the effects of RLX on lipid metabolism in female animals or humans, particularly during their menopausal period. The purpose of the present work was thus to examine the effects of RLX on fatty acid metabolism in an experimental model of estrogen deficiency in rats. The evaluation of the metabolism of a medium-chain and a long-chain fatty acid can help in the understanding of the mechanisms implicated in the possible metabolic alterations, since there are differences in the enzymatic systems responsible for

the entry of these fatty acids into the liver cells (Guo et al., 2006), the transformation to acyl-CoA (McGarry and Brown, 1997 and Eaton, 2002), the dependence from l-carnitine for the acyl-CoA entry into the mitochondria and in the enzymes that catalize the first steps of mitochondrial ADP ribosylation factor β-oxidation (McGarry and Brown, 1997). Moreover, both the medium- and long-chain fatty acids are also oxidized in the peroxisomes (Grum et al., 1994, Mannaerts et al., 1979, Piot et al., 1998 and Reddy and Mannaerts, 1994). For these reasons, in this work the oxidation of octanoate (medium-chain fatty acid) and palmitate (long-chain fatty acid) was assessed in the perfused livers and in isolated mitochondria and peroxisomes from ovariectomized (OVX) rats. The capacity of raloxifene in the induction of the peroxidase-dependent catalytic oxidation of H2O2 was also measured.

Superoxide dismutase (SOD), Catalase (CAT), glutathione peroxidas

Superoxide dismutase (SOD), Catalase (CAT), glutathione peroxidase (GPx) and glutathione reductase (GR) activities were determined in neutrophils using a microplate reader (Tecan, Salzburg, Austria). CAT activity was measured as described by Aebi (1984) based on the direct decomposition of hydrogen peroxide (H2O2). SOD activity was measured using the method described by Ewing and Janero (1995) which involves the reduction of O2- radicals by nitroblue tetrazolium (NBT) for 3 min. Glutathione buy AG-014699 peroxidase (Mannervik, 1985) and glutathione reductase (Carlberg and Mannervik, 1985) activities were measured based

on the oxidation of β-NADPH in the presence of tert-butyl hydroperoxide, used as substrate. Reduced (GSH) and oxidized (GSSG) glutathione content in neutrophils were measured as described by Rahman et al. (2006). The method is based on the reaction between reduced thiol groups (such as in GSH) with 5,5´-dithiobis-2-nitrobenzoic acid (DTNB) to form 5-thio-2-nitrobenzoic acid (TNB), which is stoichiometrically detected by absorbance at 412 nm. Purified GSH and GSSG (Sigma-Aldrich) were used as standards. The total protein content of cells was measured by the method of Bradford, using BSA as standard (Bradford, 1976). All data points are presented as the mean values with standard errors of at least three independent experiments, each one performed in triplicate. The data were

analyzed by one-way ANOVA followed by the Tukey’s post-test. The software employed for statistical analysis INCB024360 ic50 was GraphPad Prism (version4; GraphPad Software, San Diego, CA, USA). Cell membrane integrity was tested

by using flow cytometer and propidium iodide as a probe. After 24 h of culture, none of the groups showed any significant loss of cell membrane integrity. These results indicate that the concentrations of MGO, glucose, astaxanthin and vitamin C selected to evaluate the functional parameters of neutrophils did not cause cell death (Fig. 2). Additionally, MGO, high glucose, astaxanthin and vitamin C alone did not promote changes in cell viability (data not shown). In order to determine the potential of MGO and glucose to modulate the phagocytic capacity of human neutrophils, we measured Smoothened the incorporation of opsonized zymosan particles in the cells (Table 1). There was a significant decrease of 30% in the phagocytic capacity of neutrophils after treatment with glucose + methylglyoxal (GM group), whereas there was an increase of 22% in the phagocytic capacity after AV-treatment as compared to the control group. When GM-treated cells were added with antioxidants (AVGM group) we observed a complete restoration in the phagocytic capacity. Neither glucose nor MGO alone promoted the same effect observed when those compounds were combined (data not shown). Vitamin C alone promoted improvement in the phagocytic capacity (data not shown).

Vallee, whilst looking for zinc proteins

and also searchi

Vallee, whilst looking for zinc proteins

and also searching for a function for cadmium, uncovered a protein apparently for cadmium detoxification, cadmium metallothionein, in the kidney of horses [19]. A striking feature of the protein was the large numbers of cysteine residues in its sequence strongly indicative of cadmium thiolate binding. Another feature was the stoichiometry which appeared to be between four and five cadmium atoms per protein depending on the method of purification. The immediate suggestion was that one cadmium was more weakly bound. The more recent extensive work on the properties of the zinc form of this protein by his pupils, Kaegi [20] and Maret [21] and the copper proteins by Weser [22] have shown that there was similar weakish binding

of one metal ion. Selleck Antidiabetic Compound Library The binding constants of the weakly bound zinc to these buffer proteins are about 109 M− 1[21] and [23]. Before going into my own interests in zinc biochemistry, I would like to add a few personal memories and anecdotes about Bert Vallee. For fifteen years from 1955 to 1970, including a sabbatical year, 1965/1966, I worked with Vallee, mostly by long-distance exchange and enjoyed his company. The long sabbatical visit gave rise to our thoughts on the entatic state published in 1968. He was a highly intelligent and cultured man, sensibly taking relaxation in good food and horse riding. The beginning of his career as an analyst in mass spectrometry and flame photometry was broken by the death LDK378 ic50 of his professor at MIT. Vallee was left as a science orphan with a research interested

not shared by any in MIT or Harvard. How he came to have a laboratory in a Harvard hospital basement I do not know but he had to refurbish and re-equip it with little assistance. A darker side of his character was surely reinforced by this experience. As I knew him he was suspicious of the motives of others, even in 1955, as I have explained in my own case in the introduction. ASK1 He was not without friends however and I remember having lunch with Bert and one of them, Professor Eric Ball. The lunch was particularly memorable for a remark made by Eric who had listened kindly to our two very different ways of hoping to develop bioinorganic chemistry. He said, “If you two stick together you will be unstoppable.” We tried but in the end we failed — I think for a simple reason. If you worked with Bert, no matter at what level, he demanded or asked for loyalty and that we all remained secretive about our work. A great disappointment for me was that this threw a shadow over his work in the eyes of the biochemistry community. For example Bert refused to have anything to do with Lipscomb, whom I knew well, who had the crystal structure of carboxypeptidase, “Bert’s” enzyme in his own eyes. Away from his science Bert was warm, open, enjoyed witty conversation and was not afraid of jokes against himself.

A single gastric dose of 125 mg/kg BW reduced the activity of

A single gastric dose of 125 mg/kg BW reduced the activity of

both enzymes in plasma Selumetinib manufacturer [9], whereas intubation with 25 mg/kg BW for 60 d increased their activities in erythrocytes [27]. Gastric application of lower doses of 12.5 or 2.5 mg/kg BW for 60 d did not alter SOD or CAT activities in erythrocytes [11] and [27]. Of the lipid- and water-soluble antioxidants measured in plasma, only α- and γ-tocopherol (vitamin E) were significantly reduced by exposure to α-cypermethrin (P < 0.001), while retinol, ascorbic acid and uric acid concentrations were similar in all groups (Table 2). Curcumin consumption alone did not significantly alter antioxidant status compared to control, but numerically

increased vitamin E concentrations and attenuated the decreasing effect of α-cypermethrin in the combined α-cypermethrin plus curcumin group (Table 2). In a previous study, 4 wk feeding of 4 g curcumin/kg diet to Sprague-Dawley rats only numerically increased plasma, but significantly increased lung vitamin E concentrations [18]. Since low-dose dietary exposure to α-cypermethrin did not induce overt oxidative stress GSK-3 inhibitor review in our animals, it is not surprising that curcumin did not reduce oxidative stress markers in blood in the present study. A previous study reporting protective effects of curcumin used cypermethrin (dissolved in oil) at a dose of 25 mg/kg BW/d and thus produced significant oxidant effects in liver, kidney, and brain [32]. The difference between their findings and ours can be partly explained by the use of younger animals, which weighed 199-227 g at the end of the experiment [32], which is even less than the weight of our animals at the beginning (240-248 g) and half that at the end of our experiment

(Table 1). Young rats are known to be more susceptible to the toxic effects of cypermethrin. While the oral LD50 of Nitroxoline adult rats is 250 mg/kg BW, it is significantly lower for younger rats (21 d, 49; 16 d, 27; 8 d, 15 mg/kg BW) [3]. Thus, the dose used by Sankar and colleagues (2010) exceeded the intended 10% LD50 and is more likely to have been in the range of 20-40% LD50 for rats of that particular age. Better absorption and higher maximum plasma concentrations of the lipid-soluble insecticide when administered dissolved in oil may have further contributed to the observed differences (see also 3.4 Matrix effects and bioavailability considerations below). Furthermore, it cannot be ruled out, that the positive effects observed in their animals, which were given curcumin 1 h prior to cypermethrin intubation, may have been confounded, as the used curcumin was diluted in gum arabic [32]. The oral toxicity of deltamethrin, another pyrethroid, was 100 times lower when dissolved in 10% gum arabic compared to oil or other solvents [29].

Prof P believes Chris can directly access the beliefs, attitudes

Prof P believes Chris can directly access the beliefs, attitudes and motivations of keyboard workers. He needs to get inside the participants heads and report accurately on this. Chris should avoid subjectivity and transparency, rather questions should be asked in a detached and depersonalized manner to ensure he obtains the participants’ real thoughts. He needs

to be as invisible, detached and unobtrusive as possible. Chris needs to pick up inconsistencies or errors in the participants views and return the transcriptions to check for accuracy. Chris’ views need to be set-aside during the interviews so that he does not influence the findings. Prof P believes the study should be able to be replicated elsewhere with similar results. Chris should use multiple observers to verify his own observations and if possible triangulate several different sources of data to Fluorouracil increase accuracy of the data. All the data should first be collected and then analysis should be done, ideally using a predefined ICG-001 and repeatable method. It will be an advantage to ask peers to also analyse parts of the data to ensure there is agreement in the coding process. Prof P considers a follow up survey would then test the generalisability of the results. From the

case example, it can be seen that each professor holds very different epistemological views. There is internal consistency in their views of what they consider will create trustworthy knowledge, but they are not compatible with each other. The student’s own view of what counts as knowledge will help decide which direction to take. How he also manages the divergent views of his professors is thankfully another story for another paper! What this case highlights is that the epistemological position adopted by the researcher, directly influences methodology and methods used. The relationship between epistemology, methodology,

methods and knowledge creation is explained in Fig. 2. A summary of the ten qualitative research studies published in Manual Therapy is provided in Table 5. Typically, the articles have not made explicit the ontological and epistemological assumptions of the study, however Terminal deoxynucleotidyl transferase hints appear from the way in which they have conducted the study. For example, Smart and Doody (2007) and Sweeney and Doody (2010) have followed case study as described by Yin, 1994 and Yin, 2003, who comes from a positivist position. This stance is further borne out by the controls put in place to: view the videotapes in a set order and with the same pauses for each participant; during analysis pre-determined codes are used and intra- and inter-coder reliability are tested. This sits in contrast to Petty et al. (2011a), who used a case study approach within an interpretivist paradigm whereby the interview guide changed with subsequent interviews and no attempt was made to determine reliability.