Table 3 The NOS quality of included studies
Study | Selection | Comparability | Outcome | Total | Quality | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
REC | SNEC | AE | DO | SC | AF | AO | FU | AFU | |||
Stahl 2003 [4] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 5 | Moderate |
Mochiki 2004 [14] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 5 | Moderate |
Chung 2010 [23] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 6 | Moderate |
Park 2012 [16] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 5 | Moderate |
Lee 2012 [15] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 6 | Moderate |
Kim 2014 [24] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 6 | Moderate |
Lee 2015 [12] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 6 | Moderate |
Song 2015 [26] | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 6 | Moderate |