Update Alert: Use of N95, Surgical, or Cloth Masks to Prevent COVID-19 in Health Care and Community Settings: Living Practice Points From the American College of Physicians (Version 1).

Qaseem A, Etxeandia-Ikobaltzeta I, Yost J, Humphrey LL. Update Alert: Use of N95, Surgical, or Cloth Masks to Prevent COVID-19 in Health Care and Community Settings: Living Practice Points From the American College of Physicians (Version 1). Ann Intern Med. 2020 12 15; 173(12):170.

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