1. School of Nursing, Dalhousie University , Halifax, Nova Scotia , Canada
2. Department of Community Health and Epidemiology, Dalhousie University , Halifax, Nova Scotia , Canada
3. Department of Family Medicine, Dalhousie University , Halifax, Nova Scotia , Canada
4. Department of Geography, The Pennsylvania State University , University Park, PA , USA
5. Center for Behaviour Change, University College London , London , UK
6. School of Health and Human Performance, Dalhousie University , Halifax, Nova Scotia , Canada