Greg A Knoll1, Kathryn J Tinckam. 1. 1 Division of Nephrology, Kidney Research Centre, Department of Medicine, University of Ottawa, Ottawa, ON, Canada. 2 Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada. 3 Division of Nephrology, Department of Medicine and HLA Laboratory, Laboratory Medicine Program, University Health Network, University of Toronto, Toronto, ON, Canada. 4 Medical Advisor, Transplantation, Canadian Blood Services, Ottawa, ON, Canada.