Table 2 Quality assessment of the included studies according to QUADAS
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Leib 1999 [6] | Yes | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Unclear | Yes | Yes | No | No |
Tavares 2006 [25] | Yes | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Unclear | Unclear | Yes | No | No |
Grille 2012 [21] | Yes | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Unclear | Unclear | Yes | No | No |
Maskin 2013 [22] | Yes | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Unclear | Unclear | Yes | No | No |
Li 2014 [18] | Yes | Yes | Unclear | Yes | Yes | Yes | Yes | Yes | Yes | Unclear | Unclear | Yes | No | No |