Table 3.

Bias summary

Study	Random sequence generation	Allocation concealment	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other sources of bias
Kim et al. [45]	+	+	+	+	+	+
Coomes et al. [46]	?	?	+	+	+	+
Huh et al. [47]	+	+	+	+	+	+
Jain et al. [48]	?	+	+	+	+	+
Saulacic et al. [49]	+	+	+	?	+	+
Pelegrine et al. [50]	?	?	+	+	+	+
Geurs et al. [51]	+	+	+	+	+	+
Wallace et al. [52]	?	?	+	+	+	+
Mayer et al. [53]	+	+	+	+	+	+
Heberer et al. [54]	?	?	+	+	+	+
Kaigler et al. [55]	+	+	+	+	+	+

+ = low risk; ? = unclear risk; - = high risk.