1. PH Strachan (corresponding author): McMaster University, School of Nursing, HSC 2J20D, 1200 Main Street West, Hamilton, Ontario, Canada, L8N 3Z5;
2. School of Nursing, McMaster University, Hamilton, Ontario, Canada
3. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada
4. School of Nursing, McMaster University, Hamilton, Ontario, Canada, and Heart and Stroke Foundation of Ontario, Ottawa, Ontario, Canada