TABLE 2.

Summary table of the quality assessment

Study	Risk of bias element assessed					Overall risk of bias
	Randomisation process	Deviation from intended intervention	Missing outcome data	Measurement of outcome	Selection of reported results
Lavery et al. (2004) 13	(±)	(+)	(+)	(−)	(±)	High
Armstrong et al. (2007) 12	(+)	(±)	(+)	(±)	(±)	High
Lavery et al. (2007) 15	(+)	(±)	(+)	(−)	(±)	High
Skafjeld et al. (2015) 14	(+)	(+)	(+)	(±)	(±)	Moderate
Bus et al. (2021) 5	(+)	(+)	(+)	(+)	(+)	Low

Note: (+) Low; (±) Some concerns; (−) High. In the overall risk of bias, some concerns were interpreted as moderate risk of bias.