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Hebei Med Univ, Cangzhou Cent Hosp, Cangzhou Clin Med Sch, Dept Elderly Internal Med, 16 Xinhua West Rd, Cangzhou 061001, Hebei Province, Peoples R China Hebei Med Univ, Cangzhou Cent Hosp, Cangzhou Clin Med Sch, Dept Elderly Internal Med, 16 Xinhua West Rd, Cangzhou 061001, Hebei Province, Peoples R China