Table 2: Newcastle-Ottawa Scale of the included studies.

StudySelectionComparabilityOutcomeTotal Stars
Exposed CohortNon-Exposed CohortAscertainment of ExposureOutcome of InterestAssessment of OutcomeLength of Follow-UpAdequacy of Follow-Up

Yamamoto, 20128
Arsalan, 2016/7
Ramkumar, 2016/7
Miura, 2017/7
Scholtz, 2017/7