1. Department of Symptom Control and Palliative Care, Edmonton, Alberta, Canada.
2. Department of Palliative Medicine, Universities of Lausanne and Geneva, Lausaanne, Switzerland.
3. Department of Oncology, University of Alberta, Edmonton, Alberta, Canada.
4. Department of Statistics and Epidemiology Cross Cancer Institute, Edmonton, Alberta, Canada.
5. Department of Palliative Care and Rehabilitation Medicine, University of Texas M.D. Anderson Cancer Center, Houston, Texas.