Table 3 Results of quality evaluation using Methodological Index for Nonrandomized Studies (MINORS)

Ye et al. [26]

2017

2

2

0

2

0

2

2

0

2

2

2

2

18

Gallotta et al. [23]

2016

2

2

0

2

0

2

2

0

2

2

2

2

18

Bellia et al. [19]

2016

2

2

0

2

0

2

2

0

2

2

0

2

16

Chen et al. [21]

2015

2

2

0

2

0

1

2

0

2

2

2

2

17

Magrina et al. [24]

2011

2

2

0

2

0

2

2

0

2

2

2

2

18

Feuer et al. [22]

2013

2

2

0

2

0

2

2

0

2

2

1

2

17

Magrina et al. [25]

2013

2

2

0

2

0

1

2

0

2

2

2

2

17

Chen et al. [20]

2016

2

2

0

2

0

2

2

0

2

2

1

2

17