Graeme Rocker1, Jean Bourbeau2, James Downar3. 1. 1 Division of Respirology, Department of Medicine, Dalhousie University/QEII Health Sciences Centre , Halifax, Nova Scotia, Canada . 2. 2 Research Institute of the McGill University Health Centre , Montreal, Québec, Canada . 3. 3 Interdepartmental Division of Critical Care Medicine, Division of Palliative Care, Department of Medicine, University of Toronto , Toronto, Ontario, Canada .