Double-zero-event studies matter: a re-evaluation of physical distancing, face masks, and eye protection for preventing person-to-person transmission of COVID-19 and its policy impact.
Mengli XiaoLifeng LinJames S HodgesChang XuHaitao ChuPublished in: medRxiv : the preprint server for health sciences (2020)
DZS may contain useful information. Sensitivity analyses that include DZS in meta-analysis are recommended.