Effectiveness of Surgical and Cotton Masks in Blocking SARS-CoV-2: A Controlled Comparison in 4 Patients
- Type
- Retraction
- Notice date
- 6/2/2020 0:00
- Journal
- Annals of Internal Medicine
- Publisher
- American College of Physicians
- Notice DOI
- 10.7326/l20-0745
- Original paper DOI
- 10.7326/m20-1342