[1] Virginia Commonwealth Univ, Richmond, VA 23284 USA
[2] End Life Choices New York, New York, NY USA
[3] Baystate Med Ctr, Psychiat, Springfield, MA 01199 USA
[4] Univ Massachusetts, Med School Baystate, Springfield, MA USA
[5] NIH, Pain & Palliat Care Serv, Ctr Clin, Bldg 10, Bethesda, MD 20892 USA