Table 2.

Quality assessment of included studies

Study	Randomization	Concealing Allocation	Baseline Similarity	Inclusion/Exclusion Criteria	Blinded Researchers/Participants	Blinded Assessors	Attrition Rate Reported	Describing Lost Participants	Intention-to-Treat Analysis	Power Analysis	Total
Liu WT et al., 2008 [26]	Yes	No	Yes	Yes	No	No	Yes	Yes	No	Yes	6
Chau JP et al., 2012 [25]	Yes	No	Yes	Yes	No	No	Yes	Yes	No	No	5
Jehn M et al., 2013 [24]	Yes	No	Yes	Yes	No	No	Yes	No	No	No	4
Martín-Lesende I et al., 2013 [27]	Yes	No	Yes	Yes	No	No	Yes	Yes	No	Yes	6
Pedone C et al., 2013 [28]	Yes	No	Yes	Yes	No	No	Yes	Yes	Yes	Yes	7
Tabak M et al., 2014 [29, 30]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	No	No	7
Tabak M et al., 2014 [29, 30]	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	No	No	7
Wang CH et al., 2014 [31]	Yes	No	Yes	Yes	No	No	No	Yes	No	No	4