[1] City Hope Natl Med Ctr, Div Nursing Res & Educ, Duarte, CA 91010 USA
[2] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[3] Mem Sloan Kettering Canc Ctr, Pain & Palliat Care Serv, New York, NY 10021 USA
[4] Virginia Commonwealth Univ Hlth Care Syst, Richmond, VA USA