Physical distancing, face masks, and eye protection to prevent person-to-person transmission of SARS-CoV-2 and COVID-19: a systematic review and meta-analysis - Chu, D K; Akl, E A; Duda, S; Solo, K; Yaacoub, S; Schünemann, H J; COVID-19 Systematic Urgent Review Group Effort (SURGE) study authors (Lancet, 2020)
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