Table 1.

Assessment of risk of bias in the included studies

Study ID	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Luoto et al[40]	Low	Low	Low	Low	High	Low	Low
Videhult et al[39]	Low	Low	Low	Low	High	Low	Low