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Chinese Acad Med Sci, Dept Gen Surg, Beijing Hosp, Natl Ctr Gerontol, 1 Dahua Rd, Beijing 100730, Peoples R China
Chinese Acad Med Sci, Inst Geriatr Med, 1 Dahua Rd, Beijing 100730, Peoples R China
Peking Univ, Sch Clin Med 5, Beijing 100730, Peoples R China Chinese Acad Med Sci, Dept Gen Surg, Beijing Hosp, Natl Ctr Gerontol, 1 Dahua Rd, Beijing 100730, Peoples R China