Table 2.

MINORS scores of eligible studies.

Number	A	B	C	D	E	F	G	H	Total
1 [21]	2	0	2	2	0	2	2	1	11
2 [20]	2	2	2	2	0	2	2	1	13
3 [17]	2	0	2	2	0	2	1	1	10
4 [18]	2	0	2	2	0	2	2	0	10
5 [16]	2	0	2	2	0	2	2	1	11
6 [19]	2	0	2	2	0	2	2	1	11
7 [15]	2	0	2	2	0	2	2	1	11
8 [14]	2	2	2	2	0	2	2	0	12
9 [13]	2	0	2	2	0	2	2	0	10

A: a clearly stated aim; B: inclusion of consecutive patients; C: prospective collection of data; D: endpoints appropriate to the aim of the study; E: unbiased assessment of the study endpoint; F: follow-up period appropriate to the aim of the study; G: loss to follow-up less than 5%; H: prospective calculation of the sample size.