[1] Cleveland Clin, Harry R Horvitz Ctr Palliat Med, Cleveland, OH 44195 USA
[2] William Osler Hlth Ctr, Toronto, ON, Canada
[3] Univ Toronto, Toronto, ON, Canada
[4] Univ Manitoba, Dept Internal Med, Winnipeg, MB, Canada
[5] Univ Manitoba, Dept Family Med, Winnipeg, MB, Canada
[6] CancerCare Manitoba, Winnipeg, MB, Canada
[7] Winnipeg Reg Palliat Care Program, Winnipeg, MB, Canada
[8] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[9] Natl Inst Pain, COPE, New York, NY USA
[10] Naples Anesthesia & Pain Associates, Naples, FL USA