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International Association for the Study of Pain, Washington, USA
National Council on Aging, Arlington, USA
National Hospice and Palliative Care Organization, Alexandria, USA
Thirteen WNET, New York, USA
Medical College of Wisconsin, Milwaukee, USA
Textbook, The National Academies Press, Washington, USA
American Academy of Hospice and Palliative Medicine, Chicago, USA
Journal, Elsevier, Inc., Amsterdam, Netherlands
Journal, BioMed Central, London, UK
European Association for Palliative Care, Vilvoorde, Belgium
American Board of Hospice and Palliative Medicine, Chicago, USA
Textbook, WHO 1998
American Society for Pain Management Nursing, Overland Park, USA
Textbook, K. M. Foley, H. Gelband, The National Academies Press, Washington, 2001
Book, G. S. Wunderlich, P. O. Kohler, National Academy Press, Washington, USA, 2001
Book, National Academies of Sciences, Washington, USA, 2006
International Association for Hospice and Palliative Care, Houston, USA
Journal, Bandolier, Evidence Based Medicine