1. Department of Clinical Epidemiology and Biostatistics, Faculty of Health Sciences, McMaster University, Hamilton, ON
2. Department of Clinical Epidemiology and Biostatistics Unit, St. Joseph's Healthcare Hamilton, Hamilton, ON
3. School of Nursing, Faculty of Health Sciences, McMaster University, Hamilton, ON
4. Department of Surgery, Contra Costa Regional Medical Center, Martinez, CA
5. Northern Ontario School of Medicine, Division of Clinical Sciences, Sudbury, ON
6. Department of Surgery, Cross Cancer Institute, Edmonton, AB