Table S2.

Risk of bias in enrolled studies

Study	Adequate sequence generation	Allocation concealment	Blinding	Incomplete outcome data addressed	Free selective reporting	Free of other bias
Schneider et al1	Yes	No	Yes	No	No	No
Brose et al2	Yes	Yes	Yes	No	No	No
Cabanillas et al3	Yes	No	Yes	No	No	No
Schlumberger et al4	Yes	Yes	Yes	No	No	No
Berdelou et al5	Yes	No	No	No	No	No
Nervo et al6	Yes	No	No	No	No	No
Balmelli et al7	Yes	No	No	No	No	No