Table 3.

Risk of Bias in the Studies Included in the Systematic Review

Author (year)	Random sequence generation	Allocation concealment	Patient and practitioner blinding	Assessor blinding	Selective outcome reporting	Reporting drop out or withdrawal	Intention-to-treat analysis	Other potential bias	Reference
Kuptniratsaikul et al. (2009)	H	L	L	H	L	U	H	U	16
Chandran et al. (2012)	L	H	L	U	U	U	L	L	24
Madhu et al. (2013)	U	L	H	U	H	L	L	U	22
Panahi et al. (2014)	H	L	L	H	L	U	L	U	17
Kuptniratsaikul et al. (2014)	H	L	L	H	L	U	L	U	18
Belcaro et al. (2014)	H	H	H	H	L	L	L	U	19
Nakagawa et al. (2014)	L	L	L	L	U	L	L	U	20
Pinsornsalz et al. (2012)	L	U	H	L	U	L	U	U	21

H, high risk; L, low risk, U, uncertain.