Table 2.

Risk of bias of randomized controlled trial studies.

Study	Random allocation	Hidden distribution	Blind method	Incomplete outcome data	Selective reporting of results	Other bias	Quality level
Saxena 2018 [27]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	High
Pakravan 2016 [23]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	High