1. F Lau (corresponding author) School of Health Information Science, University of Victoria, PO Box 3050 STN CSC, Victoria, British Columbia, Canada V8H 3P5;
2. Victoria Hospice Society, Royal Jubilee Hospital, Victoria, British Columbia, Canada
3. Fraser Health Authority, Surrey, British Columbia, Canada; K Fassbender: Department of Oncology, University of Alberta, and Cross Cancer Institute, Edmonton, Alberta, Canada
4. Department of Mathematics and Statistics, University of Victoria, Victoria, British Columbia, Canada
5. BC Cancer Agency, Provincial Health Services Authority, Victoria, British Columbia, Canada