“…The mentioned-above seven aspects including random sequence generation, allocation concealment, blinding of participants and personnel, blinding of outcome assessment, incomplete outcome data, selective reporting and other bias of selected RCTs were evaluated according to the Cochrane Collaboration tool. Seven studies used an adequate method of random sequence generation [14][15][16]19,20,21,22], and four studies [16,19,20,23] employed allocation concealment by using the opaque, sealed envelopes. Seven studies mentioned the blinding procedure of participants and personnel [14,[16][17][18]21,22] and the blinding procedure of outcome assessment was performed appropriately in four studies [14,[16][17][18].…”