Table 4.

Risk-of-bias assessment of included RCTs

Study	Randomization process	Deviations from intended intervention	Missing outcome data	Measurement of the outcome	Selection of the reported result	Overall
Baker et al. [27]	Low	Low	Low	Low	Low	Low
Bottos et al. [28]	Some concerns	Low	Low	Low	Low	Some concerns
Buckon et al. [29]	Some concerns	Low	Low	Low	Low	Some concerns
Corry et al. [9]	Some concerns	Low	Low	Low	Low	Some concerns
Dalvand et al. [30]	Low	Low	Low	Low	Low	Low
Dursun et al. [13]	Some concerns	Low	Low	Low	Low	Some concerns
Dursun et al. [31]	Some concerns	Low	Low	Low	Low	Some concerns
El-Etribi et al. [20]	Some concerns	Low	Low	High	Low	High
Flett et al. [10]	Low	Low	Low	Low	Low	Low
Hayek et al. [32]	Some concerns	Low	Low	Low	Low	Some concerns
Koman et al. [7]	Some concerns	Low	Low	Low	Low	Some concerns
Koman et al.[23]	Some concerns	Low	Low	Low	Low	Some concerns
Maas et al. [21]	Low	Low	Low	Low	Low	Low
Radtka et al. [33]	High	Low	Low	Low	Low	High
Radtka et al. [34]	Some concerns	Low	Low	Low	Low	Some concerns
Rethlefsen et al. [35]	Some concerns	Low	Low	Low	Low	Some concerns
Sutherland et al. [12]	Low	Low	Low	Low	Low	Low
Ubhi et al. [11]	Low	Low	Low	Low	Low	Low
Xu et al. [36]	Some concerns	Low	Low	Low	Low	Some concerns
Yiğitoğlu et al. [37]	Low	Low	Low	Low	Low	Low