Supplementary Table 1. Study quality based on PEDro.

Study name	Items									Total Score
	1	2	3	4	5	6	7	8	9
Takeshima et al32), 2002	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Colado et al33), 2009	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Nualnim et al34), 2012	Yes	No	Yes	Yes	Yes	Yes	No	Yes	Yes	7
Nuttamonwarakul et al35), 2012	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Shibata et al36), 2012	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	7
Arca et al37), 2013	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Rahimi et al38), 2013	Yes	No	No	Yes	No	No	No	Yes	Yes	3
Chung et al39), 2014	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Mohr et al40), 2014a	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Mohr et al40), 2014b	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Kantyka et al41), 2015	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	5
Kim et al42), 2016	Yes	No	No	Yes	No	No	Yes	Yes	Yes	4

1: Random allocated to groups, 2: Concealed allocation, 3: Groups that were similar at baseline, 4: The blinding of assessors, 5: Outcome measures that were obtained from more than 85% of subjects, 6: Intention to treat analysis, 7: Between-group statistical comparisons, 8: Provided both point measures and measures of variability, 9: Eligibility criteria (note: eligibility criteria does not contribute to total score).