1. Department of Medicine, Division of Infectious Diseases, University of Toronto, Toronto, Canada; Keenan Research Centre, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada
2. Keenan Research Centre, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada
3. Children’s Hospital Boston, Harvard Medical School, Boston, USA
4. Spatial Ecology and Epidemiology Group, Department of Zoology, University of Oxford, Oxford, UK
5. Department of Medicine, Division of Infectious Diseases, University of Toronto, Toronto, Canada; University Health Network, Divisions of Internal Medicine and Infectious Diseases, Toronto, Canada
6. Division of Global Migration and Quarantine, Centers for Disease Control and Prevention, Atlanta, USA; Departments of Medicine and Epidemiology, Emory University School of Medicine and Rollins School of Public Health, Atlanta, USA