Notice of Retraction: Effectiveness of Surgical and Cotton Masks in Blocking SARS-CoV-2.
Ann Intern Med. 2020 Jul 7;173(1):79. doi: 10.7326/L20-0745. Epub 2020 Jun 2.
Ann Intern Med. 2020.
PMID: 32479106
Free PMC article.
No abstract available.