Table 2.

Risk of bias evaluation of included studies.

Trials	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other Bias
Vezzoli et al. (2016)	High	Unclear	Low	Low	High	Low	High
Mrakic-Sposta et al. (2015)	Unclear	Unclear	Low	Low	Low	Low	Unclear
Spanidis et al. (2017)	Unclear	Unclear	Low	Low	High	Low	Unclear
Pinho et al. (2010)	Unclear	Unclear	Low	Low	Low	Low	Low
Mastaloudis et al. (2001)	Unclear	Unclear	Low	Low	Low	Low	Unclear
Radák et al. (2000)	High	High	Low	Low	Low	Low	Low
Liu et al. (1999)	Low	Low	High	High	Low	Low	Low
Wagner et al. (2010)	Unclear	Unclear	Low	Low	High	Low	Unclear
Hessel et al. (2000)	Low	Low	Low	Low	Low	Low	Low
Suzuki et al. (2003)	Unclear	Unclear	Low	Low	Low	Low	High
Larsen et al. (2020)	High	High	Low	Low	High	Low	Unclear
Nieman et al. (2003)	Low	Low	Low	Low	Low	Low	Unclear