Table 3.

Table Risk of bias assessment of the included studies

Study	Confounding	Selection of Participants	Classification of Intervention	Deviations from Intended Intervention	Missing Data	Measurement of Outcomes	Selection of Reported Results	Overall
Xiong et al. [9]	⨂	⊕	⊕	⊕	⊕	⨂	⊕	⨂
Silva Marques et al. [10]	⨂	⨂	⊕	⊕	⊕	⨂	⊕	⨂
Duran et al. [11]	⊝	⨂	⊕	⊕	⊕	⨂	⊕	⊝
Ling et al. [12]	⨂	⊕	⊕	⊕	⊕	⨂	⊕	⨂
Docampo-Vázquez et al. [13]	⊝	⨂	⊕	⊕	⊕	⊕	⊕	⊝
			⊕ Low	⨂ Unclear	⊝ High

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