Study Selection and Extraction
All steps of the systematic review were performed in duplicate. Study
selection was completed by two independent, parallel reviewers (AK, SL)
for both title and abstract screening as well as full-text screening.
Data extraction was performed by two investigators (AK, SL), with a
third (XL) resolving discrepancies. Outcomes were summarized
descriptively. Risk of bias for individual studies was graded using an
adapted rating scale based on the Risk of Bias Instrument for
Cross-Sectional Surveys of Attitudes and Practices.19