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Chinese Acad Med Sci, Beijing Hosp, Inst Geriatr Med, Natl Ctr Gerontol,Dept Pulm & Crit Care Med, Beijing 100730, Peoples R China Chinese Acad Med Sci, Beijing Hosp, Inst Geriatr Med, Natl Ctr Gerontol,Dept Pulm & Crit Care Med, Beijing 100730, Peoples R China