5 Social Analysis and Modeling Division, Statistics Canada, 100 Tunney's Pasture, Ottawa, Ontario K1A0T6, Canada.
6 Department of Community Health Sciences, University of Manitoba, 408-727 McDermot Avenue, Winnipeg, Manitoba R3E3P5, Canada.
7 Interdepartmental Division of Critical Care, University of Toronto, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, Ontario M4N3M5, Canada.
8 Department of Medicine, University of Michigan, 1500 E Medical Center Drive, Ann Arbor, Michigan 48109, USA.
9 Department of Economics, Massachusetts Institute of Technology, Morris and Sophie Chang Building, 50 Memorial Drive, E52-300, Cambridge, Massachusetts 02142, USA.
10 Department of Medicine, University of Manitoba, 820 Sherbrook Street, Room GF-222, Winnipeg, Manitoba R3A1R9, Canada.