Table 2 Assessing the quality of non-randomized studies by Newcastle-Ottawa Scale
Selection | Comparability | Outcome | Overall quality | |
|---|---|---|---|---|
Bhasin 2012 [25] | ★★ | ★ | ★★★ | Moderate |
Bhasin 2013 [26] | ★★ | ★ | ★★★ | Moderate |
Bhasin 2016 [27] | ★★ | ★★ | ★★ | Moderate |
Bhasin 2017 [28] | ★★ | ★ | ★★★ | Moderate |
Ghali 2016 [29] | ★★ | ★★ | ★★★ | High |
Meng 2009 [30] | ★★ | ★ | ★★★ | Moderate |
Moniche 2012 [31] | ★★ | ★★ | ★★★ | High |