[1] Univ Calif San Francisco, Palliat Care Program, Div Hosp Med, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Dept Med, Div Gen Internal Med, San Francisco, CA 94143 USA
[3] Univ Colorado, Sch Med, Dept Med, Div Gen Internal Med, Aurora, CO USA
[4] San Diego Hosp, Inst Palliat Med, San Diego, CA USA