Sample size determination
The authors estimated a study sample of 57 patients (28 in each group), this sample size would guarantee 80% power to detect unforeseen problems, such as ambiguous eligibility criteria or misinterpretations of questionnaire items, with a two‐sided type one error rate of 5%. The research team was finally able to recruit 88 patients of which 84 completed the study, which exceeded the minimum sample size calculated after applying the sample calculation formula proposed by Viechtbauer.