1 ICES, 2075 Bayview Ave, Toronto, ON, M4N 3M5, Canada.
2 Institute for Health Policy, Management and Evaluation, University of Toronto, 155 College Street, Suite 425, Toronto, ON, M5T 3M6, Canada.
3 Health Data Research Network Canada, 2206 East Mall, Vancouver, BC, V6T 1Z3, Canada.
4 MRC Clinical Trials Unit at UCL, Institute of Clinical Trials and Methodology, 90 High Holborn, University College London (UCL), London, WC1V 6LJ, UK.
5 Health Data Research UK, Gibbs Building, 215 Euston Road, London, NW1 2BE, UK.
6 Population Data BC, 2206 East Mall, Vancouver, BC, V6T 1Z3, Canada.
7 School of Population and Public Health, University of British Columbia, 2206 East Mall, Vancouver, BC, V6T 1Z3, Canada.