1. BC Centre for Disease Control, Population and Public Health , 655 W 12th Avenue, Vancouver, BC V5Z 4R4 , Canada
2. School of Kinesiology, University of British Columbia , 210-6081 University Boulevard, Vancouver, BC V6T 1Z1 , Canada
3. School of Population and Public Health, University of British Columbia , 2206 E Mall, Vancouver, BC V6T 1Z3 , Canada
4. Population and Public Health, BC Centre for Disease Control , 655 W 12th Avenue, Vancouver, BC V5Z 4R4 , Canada
5. Healthy Schools and Physical Activity, BC Ministry of Health, Stn Prov Gov , PO Box 9646, Victoria, BC V8W 9P1 , Canada