Table 2.

Risk of bias of the studies included [Higgins et al. (16)]

Author (Ref.)	Adequate Sequence Generation	Allocation Concealment	Blinding	Incomplete Outcome Data Addressed	Free of Selective Reporting	Free of Other Bias
Fotherby and Potter (23)	Yes	Yes	Yes	Yes	Yes	Yes
Houlihan et al. (12,28)	Yes	No	No	Unclear	Yes	Yes
Luik et al. (25)	Yes	No	No	Unclear	Yes	No
Vedovato et al. (26)	Yes	No	No	Unclear	Yes	No
Swift et al. (24)	Yes	Yes	Yes	Yes	Yes	Yes
Vogt et al. (13)	Yes	No	No	Unclear	Yes	Yes
He et al. (27)	Yes	Yes	Yes	Yes	Yes	Yes
Ekinci et al. (14)	Yes	Yes	Yes	Yes	Yes	Yes
Slagman et al. (29)	Yes	No	No	Yes	Yes	Yes
McMahon and colleagues (30,31)	Yes	Yes	Yes	Yes	Yes	No
Kwakernaak et al. (32)	Yes	Yes	No	Yes	Yes	Yes