Table 3.

Risk of bias assessment.

Reference	Baseline Confounding	Selection of Partecipants	Classification of Intervention	Deviation from Intended Intervention	Missing Data	Measurement of Outcomes	Selection of Reported Results	Overall Risk of Bias
Hamaoka [15]	Low	Moderate	Low	Moderate	Low	Low	Low	Moderate
Ryon [16]	Moderate	Moderate	Low	Moderate	Moderate	Low	Low	Moderate
Peng [17]	Low	Low	Low	Low	Low	Low	Low	Low
Zheng [18]	Low	Moderate	Low	Low	Moderate	Low	Low	Moderate
Kokudo [19]	Moderate	Serious	Moderate	Moderate	Serious	Low	Low	Serious
Tang [20]	Moderate	Moderate	Low	Moderate	Moderate	Low	Low	Moderate
Fan [21]	Serious	Moderate	Moderate	Serious	Moderate	Low	Moderate	Serious
Ye [22]	Moderate	Moderate	Moderate	Seious	Moderate	Moderate	Low	Serious
Zhang [23]	Moderate	Moderate	Low	Moderate	Low	Moderate	Moderate	Moderate