American Academy of Hospice & Palliative Medicine
American Academy of Pain Medicine
American Alliance of Cancer Pain Initiatives
American Pain Foundation
American Pain Society
American Society for Pain Management Nursing
Hospice and Palliative Nurses Association
International Association for the Study of Pain
Mayday Pain Project
The National Hospice & Palliative Care Organization
The National Pain Foundation
Pain Action
PainEDU.org
PainKnowledge.org
Pain Online
Pain & The Law
Partners Against Pain
The Promise Initiative
University of Wisconsin Pain & Policy Studies Group
Worldwide Congress on Pain