[1] Sichuan Univ, Ctr Gerontol & Geriatr, West China Hosp, POB 610041,37 Guo Xue St, Chengdu 610041, Sichuan, Peoples R China
[2] Sichuan Univ, Natl Clin Res Ctr Geriatr, West China Hosp, POB 610041,37 Guo Xue St, Chengdu 610041, Sichuan, Peoples R China
[3] Sichuan Univ, West China Hosp, West China Sch Nursing, POB 610041,37 Guo Xue St, Chengdu 610041, Sichuan, Peoples R China
[4] Sichuan Univ, West China Hosp, Dept Rehabil Med Ctr, POB 610041,37 Guo Xue St, Chengdu 610041, Sichuan, Peoples R China