Table 3.

Quality assessment based on the Jadad scale.

Author (year)	Randomization	Double blinding	Withdrawals and dropouts	Total score
Huang et al. (2015)	1	2	0	3
Huo et al. (2014)	1	0	0	1
Li et al. (2016)	1	0	0	1
Lin et al. (2018)	1	0	1	2
Qian et al. (2016)	1	0	0	1
Su et al. (2017)	1	0	0	1
Wan et al. (2017)	2	0	1	3
Wang et al. (2018)	0	0	1	1
Wu et al. (2012)	1	0	0	1
Xing et al. (2014)	2	0	0	2
You et al. (2015)	1	0	0	1
Zhang et al. (2016)	1	0	1	2
Zhang et al. (2017)	1	0	0	1
Zhou et al. (2013)	1	0	0	1