1. Center for Communicable Disease Dynamics and Departments of Epidemiology and Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA.
2. Department of Global Health and Population, Harvard T. H. Chan School of Public Health and Center for Bioethics, Harvard Medical School, Boston, MA, USA.
3. Center for Inference and Dynamics of Infectious Diseases, Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.
4. Department of Biostatistics, University of Washington, Seattle, WA 98105, USA.
5. Center for Communicable Disease Dynamics and Departments of Epidemiology and Biostatistics, Harvard T. H. Chan School of Public Health, and Harvard-MIT Division of Health Sciences and Technology, Boston, MA, USA.
6. Center for Inference and Dynamics of Infectious Diseases, Department of Biostatistics, College of Public Health and Health Professions, and College of Medicine, University of Florida, Gainesville, FL, USA.
7. Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA.
8. Center for Comprehensive Access and Delivery Research and Evaluation, Iowa Veterans Affairs Health Care System, Iowa City, IA, USA.
9. Epicentre, Paris, France.