Mass masking in the COVID-19 epidemic: people need guidance.

keywords

author 👤 Leung, Chi Chiu 👤 Lam, Tai Hing 👤 Cheng, Kar Keung

year ⏰ 2020

journal 📚 Lancet

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doi 📄 10.1016/S0140-6736(20)30520-1 ⤴

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