Table 1

Quality of Each Nonrandomized Case-Control Study Included in the Meta-Analysis Individually Appraised Based on the Newcastle-Ottawa Scale

First Author (Year) (Ref. #)SelectionComparabilityExposure
Köbe et al. (2013) (14)★★★★★
Brouwer et al. (2016) (11)★★★★★★★
Honarbakhsh et al. (2016) (10)★★★★★
Friedman et al. (2016) (12)★★★★★★
Mithani et al. (2016) (13)★★★★★