COVID-19 news from Annals of Internal Medicine

(American College of Physicians) 1. Clinical Validity of COVID-19 Serum Antibodies ; 2. Qualitative Assessment of Rapid System Transformation to Primary Care Video Visits at an Academic Medical Center ; 3. Obesity and COVID-19 in New York City: A Retrospective Cohort Study ; 4. Regulatory T Cells for Treating Patients With COVID-19 and Acute Respiratory Distress Syndrome: Two Case Reports.