Comment on

• Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers : A Randomized Controlled Trial.

  Bundgaard H, Bundgaard JS, Raaschou-Pedersen DET, von Buchwald C, Todsen T, Norsk JB, Pries-Heje MM, Vissing CR, Nielsen PB, Winsløw UC, Fogh K, Hasselbalch R, Kristensen JH, Ringgaard A, Porsborg Andersen M, Goecke NB, Trebbien R, Skovgaard K, Benfield T, Ullum H, Torp-Pedersen C, Iversen K. Bundgaard H, et al. Ann Intern Med. 2021 Mar;174(3):335-343. doi: 10.7326/M20-6817. Epub 2020 Nov 18. Ann Intern Med. 2021. PMID: 33205991 Free PMC article. Clinical Trial.
• Effectiveness of Adding a Mask Recommendation to Other Public Health Measures.

  Rand J. Rand J. Ann Intern Med. 2021 Aug;174(8):1194. doi: 10.7326/L21-0400. Ann Intern Med. 2021. PMID: 34399071 No abstract available.
• Effectiveness of Adding a Mask Recommendation to Other Public Health Measures.

  Gaines H. Gaines H. Ann Intern Med. 2021 Aug;174(8):1193. doi: 10.7326/L21-0398. Ann Intern Med. 2021. PMID: 34399077 No abstract available.
• Effectiveness of Adding a Mask Recommendation to Other Public Health Measures.

  Llor C. Llor C. Ann Intern Med. 2021 Aug;174(8):1194. doi: 10.7326/L21-0399. Ann Intern Med. 2021. PMID: 34399078 No abstract available.
• Effectiveness of Adding a Mask Recommendation to Other Public Health Measures.

  Moran B. Moran B. Ann Intern Med. 2021 Aug;174(8):1192-1193. doi: 10.7326/L21-0396. Ann Intern Med. 2021. PMID: 34399079 No abstract available.
• Effectiveness of Adding a Mask Recommendation to Other Public Health Measures.

  Spinelli MA, Glidden DV, Gennatas ED, Rutherford GW, Gandhi M. Spinelli MA, et al. Ann Intern Med. 2021 Aug;174(8):1193. doi: 10.7326/L21-0397. Ann Intern Med. 2021. PMID: 34399080 No abstract available.