Table 2.

MINORS appraisal scores for the included studies.

Study	Methodological items												Total
	1	2	3	4	5	6	7	8	9	10	11	12
Zhao et al.	2	1	0	1	0	2	2	0	1	2	1	2	14
Song	2	2	0	2	0	2	1	0	2	2	2	2	17
Shang et al.	2	1	0	2	0	2	1	0	2	2	2	2	16
Wang et al.	2	2	0	2	0	2	2	0	2	2	1	2	17
Lin et al.	2	2	0	2	0	2	1	0	2	2	2	2	17
Liu et al.	2	2	0	2	0	2	2	0	1	2	1	2	16
Liu et al.	2	1	0	2	0	2	1	0	2	2	2	2	16
Götz et al.	2	2	0	2	0	2	2	0	2	2	2	2	18