“…Thirteen studies mentioned the method of random sequence generation [11,12,13,14,15,16,17,18,19,20,21,22,23], and 10 studies used allocation concealment [11,14,23,24,25,26,27,28,29,30]. Patients were blinded in 39 studies [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49], whereas outcome assessors were blinded in 25 studies [11,12,13,16,17,18,19,20,21,22,23,24,25,27,28,29,30,31,34,35,36,37,38,40,42].…”