[1] Johns Hopkins Univ, Sch Med, Div Gen Internal Med, Palliat Med Sect, 600N Wolfe St,Suite 359, Baltimore, MD 21287 USA
[2] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[3] Johns Hopkins Univ, Sch Nursing, Baltimore, MD USA
[4] Johns Hopkins Univ, Sch Med, Div Geriatr Med & Gerontol, Baltimore, MD USA
[5] Johns Hopkins Univ, Sch Med, Div Gen Internal Med, Baltimore, MD USA
[6] Washington Univ, Barnes Jewish Hosp, Goldfarb Sch Nursing, Div Palliat Med, St Louis, MO 63110 USA