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Chinese Acad Med Sci, Beijing Hosp, Inst Geriatr Med, Dept Surg Intens Care Med,Natl Ctr Gerontol, 1 DaHua Rd, Beijing 100730, Peoples R China Chinese Acad Med Sci, Beijing Hosp, Inst Geriatr Med, Dept Surg Intens Care Med,Natl Ctr Gerontol, 1 DaHua Rd, Beijing 100730, Peoples R China