Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Assessment of risk of bias in retrospective cohort and case-controlled trials by Newcastle-Ottawa Scale tool.
| Author | Year | Selection | Comparability | Outcome | Score |
| Abdelfatah et al | 2020 | 3 | 2 | 3 | 8 |
| Shen et al | 2020 | 4 | 2 | 2 | 8 |
| Landreneau et al | 2019 | 4 | 1 | 2 | 7 |
