Table 2.

Quality of the included studies.

Studies (first author, year)	Randomization	Allocation concealment	Blinding	Incomplete outcome data	Withdrawals and dropouts
Hu [10], 2010	Yes	NMT	NO	Yes	NMT
Wen [11], 2012	Yes	NMT	NO	Yes	NMT
Li [12], 2016	Yes	NMT	NO	Yes	MT
Xia [13], 2011	Yes	NMT	NO	Yes	NMT
Li [14], 2018	Yes	NMT	NO	Yes	NMT
Gao [15], 2017	Yes	NMT	NO	Yes	NMT
Zhou [16], 2011	Yes	NMT	NO	Yes	MT
Gong [17], 2018	Yes	NMT	NO	Yes	NMT
Xu [18], 2013	Yes	NMT	NO	Yes	NMT
Xiong [19], 2009	Yes	NMT	NO	Yes	NMT

MT: mentioned; NMT: not mentioned.