1. Department of Mathematics, Imperial College London, London, UK
2. British Columbia Centre for Disease Control, Communicable Disease Prevention and Control Services, Vancouver, Canada
3. School of Population and Public Health, University of British Columbia, Vancouver, Canada
4. Department of Epidemiology, Columbia University Mailman School of Public Health, New York, USA
5. Phthisiopneumology Institute, Chisinau, Republic of Moldova
6. Yale University School of Public Health, New Haven
7. Department of Mathematics, Simon Fraser University, Vancouver, Canada