1. W. Maurice Young Centre for Applied Ethics, University of British Columbia, 235-6356 Agricultural Road, Vancouver, BC Canada V6T 1Z2,
2. Alliance for Self-Care Research, Department of Nursing and Midwifery, University of Stirling, Stirling FK9 4LA, UK
3. Medical Research Council, Social and Public Health Sciences Unit, University of Glasgow, 4 Lilybank Gardens, Glasgow G12 8RZ, UK