1. Cancer Pain Relief and Palliative Care: Report of a WHO Expert Committee,1990
2. Symptomatic management of the older person with cancer;Sheehan;Clin Geriatr Med,1997
3. Seeking a better way to die;Horgan;Sci Am May,1997
4. Approaching Death: Improving Care at the End of Life;Fields,1997
5. National Hospice Organization: NHO statistics. National Hospice Organization, 2000. Available at http://www.nhpco.org