[1] Kings Coll London, Weston Educ Ctr, Dept Palliat Care & Policy, London SE5 9RJ, England
[2] Peace Hospice, Watford, Herts, England
[3] London Sch Hyg & Trop Med, Hlth Serv Res Unit, Dept Publ Hlth & Policy, London WC1, England
[4] London Sch Hyg & Trop Med, Dept Populat Hlth & Epidemiol, London WC1, England