We used the results of Mehri et al. study (2008) and
the following formula for calculating the sample size,
n ¼ 2ððZ1a=2ÞþðZ1bÞÞ
2
ðl1l2Þ=S . Accordingly, with a confidence level
of 95% and a power of 80%, the sample size was deter-
mined to be 31 patients in each group. We employed the
coin-tossing method to randomly assign the patients to
either the control or the experimental groups. We asked
the patients to refer to the study setting to receive the
study intervention.