1. Division of Infectious Diseases, Department of Medicine Johns Hopkins University School of Medicine Baltimore Maryland USA
2. Department of Environmental Health and Engineering Epidemiology and International Health Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA
3. Department of Environmental Health and Engineering Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA
4. Johns Hopkins Medicine COVID Testing The Johns Hopkins Medical Institutions Baltimore Maryland USA
5. Division of Geriatric Medicine and Gerontology, Department of Medicine Johns Hopkins University School of Medicine Baltimore Maryland USA
6. Department of Health Policy and Management Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA