Table 2. Quality assessment for the including study.

No.	Study	Year	Grouping method	Blinding	ITT	Baseline data	Diagnostic criteria	Confrontation factor control	Quality level
1	Cozzi et al. [20]	2016	2	0	1	1	2	0	6
2	Feng et al. [21]	2016	2	0	2	0	2	2	8
3	Matsuo et al. [22]	2015	2	0	2	1	2	2	9
4	Chen et al. [23]	2015	2	0	2	0	2	2	8
5	Man et al. [24]	2015	2	0	2	2	2	2	10
6	Digklia and Voutsadakis [25]	2014	2	0	2	1	2	2	9
7	Allensworth et al. [26]	2013	2	0	2	0	2	2	8
8	Qiu et al. [27]	2012	2	0	1	1	2	2	9
9	Lee et al. [28]	2011	2	0	1	1	2	2	8
10	Gungor et al. [29]	2017	2	0	1	1	2	2	8
11	Li et al. [15]	2004	2	0	1	0	2	2	7

ITT, intention to treat.