作者单位:Beijing Hosp, Dept Anesthesiol, Natl Ctr Gerontol, Beijing, Peoples R China[1]Univ Calif Los Angeles, David Geffen Sch Med, Dept Surg, Los Angeles, CA 90095 USA[2]Mahidol Univ, Ramathibodi Hosp, Dept Anesthesiol, Fac Med, Bangkok, Thailand[3]Ronald Reagan UCLA Med Ctr, Dept Anesthesiol, Los Angeles, CA USA[4]