1. PC Coyte (corresponding author): Institute of Health Policy, Management and Evaluation, Faculty of Medicine, University of Toronto, McMurrich Building, 2nd floor, 12 Queen's Park Crescent West, Toronto, Canada M5S 1A8;
2. Department of Risk Management and Insurance, School of Economics, Nankai University, Tianjin, China, and Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
3. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada