| Author/Year | Representativeness of the exposed cohort | Selection of the non exposed cohort | Ascertainment of exposure | Demonstration that outcome was not present at study start | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Enough follow-up periods (≥ 5 years) | Adequacy of follow-up of cohorts | TotalNOS |
|---|
| Pilz 2006 [7] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
| Shioji 2007 [8] | ★ | ★ | ★ | ★ | ★★ | ★ | | ★ | 8 |
| Piestrzeniewicz 2008 [9] | | ★ | ★ | ★ | ★ | ★ | | ★ | 6 |
| Maiolino 2008 [12] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
| Huang 2010 [10] | | ★ | ★ | ★ | ★ | ★ | | ★ | 6 |
| Wilson 2011 [13] | | ★ | ★ | ★ | ★★ | ★ | | ★ | 7 |
| Beatty 2012 [14] | | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 8 |
| Li 2012 [11] | ★ | ★ | ★ | ★ | ★ | ★ | | ★ | 7 |
| Lindberg 2012 [19] | | ★ | ★ | ★ | ★★ | ★ | | ★ | 7 |
| Delhaye 2013 [20] | ★ | ★ | ★ | ★ | ★ | ★ | | ★ | 7 |
| Hascoet 2013 [21] | | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 |
| Pratesi 2016 [22] | | ★ | ★ | ★ | ★ | ★ | | ★ | 6 |
- NOS Newcastle-Ottawa Scale
