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Harbin Med Univ, Affiliated Hosp 2, Dept Geriatr, Harbin 150086, Heilongjiang, Peoples R China
Harbin Med Univ, Affiliated Hosp 2, Int Phys Examinat & Hlth Ctr, Harbin 150086, Heilongjiang, Peoples R China Harbin Med Univ, Affiliated Hosp 1, Dept Resp, Harbin 150086, Heilongjiang, Peoples R China