1. Department of Medicine, University of Toronto, Toronto, Canada
2. Department of Medicine, McMaster University, Hamilton, Canada
3. Health Sciences Library, St. Michael’s Hospital
4. Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada
5. Department of Zoology, University of Oxford, Oxford, UK
6. Centre for the Mathematical Modelling of Infectious Diseases, London School of Hygiene & Tropical Medicine, London, UK
7. Divisions of General Internal Medicine and Infectious Diseases, University Health Network, Toronto, Canada