Table II.

Methodological Index for Nonrandomized Studies (MINORS) scoring and level of evidence of 13 included studies.

Sr. no	Author	Year	MINORS score (maximum score = 16)	Level of evidence
1	Raiss et al14	2017	10	Level IV
2	Statz et al19	2016	11	Level IV
3	Van Tongel et al21	2016	10	Level IV
4	Werner et al22	2014	9	Level IV
5	Kurowicki et al8	2016	13	Level III
6	Flatow et al3	1993	6	Level IV
7	Raiss et al13	2009	8	Level IV
8	Matsoukis et al10	2006	9	Level IV
9	Li et al9	2016	10	Level IV
10	Pritchett et al12	1987	8	Level IV
11	Wooten et al24	2014	9	Level IV
12	Gavriilidis et al5	2010	10	Level IV
13	Cheng et al1	1997	12	Level IV