[1] Chinese Acad Med Sci, Beijing Hosp, Inst Geriatr Med, Natl Ctr Gerontol, Beijing, Peoples R China
[2] Chinese Acad Med Sci, Peking Union Med Coll, Grad Sch, Beijing, Peoples R China
[3] Chinese Acad Med Sci, Beijing Hosp, Natl Ctr Gerontol, Dept Dermatol, 1 DaHua Rd, Beijing 100730, Peoples R China
[4] Chinese Acad Med Sci, Inst Geriatr Med, 1 DaHua Rd, Beijing 100730, Peoples R China