Table 2. Risk of bias assessment of included studies.

Trial	Randomsequencegeneration	Allocationconcealment	Blinding ofparticipantsand personnel	Blindingof outcomeassessment	Incompleteoutcomedata	Selectivereporting	Otherbias
Yang et al.19	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Akcayoz et al.20	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Kim et al.22	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Nuhoglu et al23	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Patankar et al.24	Unclear	Low	Low	Low	Low	Unclear	Low
Seckiner et al.25	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Erturhan et al.27	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Iori et al.28	Unclear	Low	Unclear	Unclear	Low	Low	Low
Kong et al.31	Low	Low	Low	Unclear	Low	Low	Low
Bhansali et al.30	Low	Low	Unclear	Low	Low	Low	Low
Autorino et al.21,26,29	Low	Unclear	Unclear	Low	Low	Low	Low
Singhania et al.32	Low	Unclear	high	Unclear	Low	Low	Low
Xie et al.34	Unclear	Low	high	high	Low	Low	Low
Huang et al.33	Low	Low	Unclear	Unclear	Low	Low	Low
Giulianelli et al.35	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Kumar et al.36	Low	Unclear	Unclear	Unclear	Low	Low	Low