1. Department of Population Medicine, Harvard Medical School, Harvard Pilgrim Health Care Institute, Boston, Massachusetts
2. National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
3. Office of Public Health Data, Surveillance, and Technology, Centers for Disease Control and Prevention, Atlanta, Georgia
4. Department of Population Health Sciences, Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
5. Department of Internal Medicine, University of Michigan Health, Ann Arbor, Michigan
6. Coronavirus and Other Respiratory Viruses Division, Centers for Disease Control and Prevention, Atlanta, Georgia
7. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
8. Louisiana Public Health Institute, New Orleans, Louisiana