Table 2. Quality assessment of the studies.

Study	Scale
Kudo et al. 2011	4
Sansonno et al. 2012	4
Hoffmann et al. 2015	5
Lencioni et al. 2016	4
Qu et al. 2012	20
Bai et al. 2013	19
Muhammad et al. 2013	18
Huang et al. 2013	15
Hu et al. 2014	18
Takamasa et al. 2015	17
Yao et al. 2015	17
Zhang et al. 2016	19
Wan et al. 2016	20
Lee et al. 2017	19

RCT were assessed by Jadad scale. Comparative studies were assessed by MINORS. RCT, randomized controlled trials.