Tenforde MW, Kim SS, Lindsell CJ, Billig Rose E, et al. Symptom Duration and Risk Factors for Delayed Return to Usual Health Among
Outpatients with COVID-19 in a Multistate Health Care Systems Network - United
States, March-June 2020. MMWR Morb Mortal Wkly Rep 2020;69:993-998.
PMID: 32730238