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Chinese Peoples Liberat Army Gen Hosp, Dept Resp Med, Med Ctr 2, Beijing, Peoples R China
Chinese Peoples Liberat Army Gen Hosp, Natl Clin Res Ctr Geriatr Dis, Med Coll Peoples Liberat Army, Beijing, Peoples R China Chinese Acad Med Sci & Peking Union Med Coll, Inst Basic Med Sci, Ctr Syst Med, Beijing, Peoples R China