作者单位:Univ Calif San Francisco, Sch Med, Zuckerberg San Francisco Gen Hosp, Div Hosp Med, San Francisco[1]Icahn Sch Med Mt Sinai, Dept Med Geriatr & Palliat Med, New York, NY 10029 USA[2]Mayo Clin, Dept Med, Div Gen Internal Med, Rochester, MN 55905 USA[3]