Table 2 Quality assessment of the included studies
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 |