Table S2. Quality assessment for RCTs (method: Cochrane collaboration’s tool for assessing risk of bias).

Author	Selection bias			Performance bias		Detection bias		Attrition bias		Reporting bias		Other bias		Total
	Random sequence generation	Allocation concealment		Binding of participant and personnel		Blinding of outcome assessment		Incomplete outcome data		Selective reporting		Anything else, ideally prespecifed		Low on risk of bias
Spiliotis J	Low	Low		Low		Low		Unclear		Unclear		Low		5/7

RCTs, randomized controlled trials.