Contribution to Authorship

EC: Project design and conception. Prospectively registered and independently performed aspects of the systematic review and meta-analysis including title/abstract screening, data extraction, data analysis, risk of bias assessments, statistical analysis, interpretation of results and project writeup.
RH: Performed independent title/abstract screening, independent double data extraction for the recurrence of OASI data and independent risk of bias assessments.
KA: Performed independent double data extraction for the included studies.
JM: Contributed substantially to writeup and clinical interpretation of results.
RK: Instrumental in project design and conception. Performed data analysis and substantially contributed to project writeup and interpretation of results.