“…Although many previous researchers who adapted V-RQOL had extended the test-retest interval to 2 weeks, 5,10,13,14,21 the time interval was more than that in some studies and especially in the process of administrating the original version of V-RQOL. 3,19,25 Among them, Westen et al 30 suggested ''a few weeks'' as the best test-retest interval for objective tests with Likert scale and over a 2-month period for the subjective ones. We, too, adopted the 2-week interval.…”