[1] Cent South Univ, Xiangya Sch Publ Hlth, Dept Epidemiol & Biostat, Changsha, Hunan, Peoples R China
[2] Cent South Univ, Xiangya Nursing Sch, Changsha, Hunan, Peoples R China
[3] Cent South Univ, Xiangya Hosp, Dept Geriatr, Changsha, Hunan, Peoples R China
[4] Cent South Univ, Xiangya Hosp, Natl Clin Res Ctr Geriatr Disorders, Changsha, Hunan, Peoples R China
[5] Hunan Prov Key Lab Clin Epidemiol, Changsha, Peoples R China
[6] Cent South Univ, Xiangya Sch Publ Hlth, 172 Tongzipo Rd, Changsha, Hunan, Peoples R China