Study Sequence
generation 		Allocation
concealment 		Blinding of
participants,
personnel 		Blinding of
outcome
assessors 		Incomplete
outcome
data 		Selective
outcome
reporting 		Other
sources of
bias 		Study
quality of
bias
Lim and Ngeow [30] Yes Yes Yes Yes Yes Yes Yes Low risk
Chaudhary et al. [31] Unclear Unclear Yes Yes Yes Yes Yes Unclear risk
Üstün et al. [32] Unclear Unclear Yes Yes Yes Yes Yes Unclear risk
Laureano Filho et al. [33] Unclear Unclear Unclear Yes Yes Yes Yes Unclear risk
Agostinho et al. [34] Unclear Unclear Yes Yes Yes Yes Yes Unclear risk
Graziani et al. [35] Yes Yes Yes Yes Yes Yes Yes Low risk
Boonsiriseth et al. [36] Unclear Unclear Yes Yes Yes Yes Yes Unclear risk