Table 2.

Risk of bias assessment.

References	Random sequence generation (selection bias)	Allocation concealment (selection bias)	Blinding of participants and personnel (performance bias)	Blinding of outcome assessment (detection bias): self-reported outcomes	Incomplete outcome data (attrition bias)	Selective reporting (reporting bias)	Other bias
Yeh et al. (69)	High	High	High	Low	Low	Low	High: small smaple size/no control group/no homogeneous clinical sample
Llorèns et al. (70)	High	High	High	Low	Low	Low	High: small sample size/no control group
White et al. (71)	High	High	High	High	Low	Low	High: small sample size/no control group/only interview assessment
Ferreira et al. (72)	High	High	High	Low	Low	Low	High: small sample size
Nijenhuis et al. (73)	High	High	High	Low	Low	Low	High: small sample size/no control group
Lloréns et al. (74)	Low	Low	Low	Low	Low	Low	Low
Palacios-Ceña et al. (75)	High	High	High	High	Low	Low	High: small sample size/no control group/only interview assessment
Houlihan et al. (76)	Low	Low	Low	Low	Low	Low	Low
Engelhard et al. (77)	High	High	High	Low	Low	Low	High: no control group
Lai et al. (78)	High	High	High	Low	Low	Low	Low
Skolasky et al. (79)	Low	Low	Low	Low	Low	Low	Low
Pitt et al. (80)	High	High	High	Low	High	Low	High: small sample size/no control group
D'hooghe et al. (81)	High	High	High	Low	Low	Low	High: no control group
Dennett et al. (82)	Low	Low	Low	Low	Low	Low	Low
De Vries et al. (83)	High	High	High	High	Low	Low	High: small sample size/no control group/only interview assessment
Thomas et al. (84)	High	High	High	High	Low	Low	High: small sample size/no control group/only interview assessment/no homogeneous clinical sample
Chemtob et al. (85)	High	High	High	High	Low	Low	High: small sample size/only interview assessment
Ellis et al. (86)	Low	Low	Low	Low	Low	Low	Low

High, High risk of bias; Low, Low risk of bias.