• Ann. Intern. Med. · Aug 2021

    Comment Letter

    Effectiveness of Adding a Mask Recommendation to Other Public Health Measures.

    • Carl Llor.
    • University Institute in Primary Care Research Jordi Gol, Via Roma Health Centre, Barcelona, Spain, and University of Southern Denmark, Odense, Denmark.
    • Ann. Intern. Med. 2021 Aug 1; 174 (8): 1194.

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