Affiliation: | 1. Carolinas Pain Institute and The Center for Clinical Research, Winston Salem, North Carolina, U.S.A.;2. Four Seasons Hospice and Palliative Care, Flat Rock, North Carolina, U.S.A.;3. Insys Therapeutics, Inc., Chandler, Arizona, U.S.A.;4. The Center for Pain and Supportive Care, Scottsdale, Arizona, U.S.A. |