[1] Univ Calif Los Angeles, David Geffen Sch Med, Los Angeles, CA 90095 USA
[2] Johns Hopkins Sch Med, Johns Hopkins Bayview Med Ctr, Div Gen Internal Med, Palliat Care Program, Baltimore, MD USA
[3] Univ Calif Los Angeles, Med Ctr, Dept Med, Palliat Care Program, 1328 16th St,2nd Floor,Room 207, Santa Monica, CA 90404 USA