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Zhengzhou Univ, Affiliated Canc Hosp, Dept Clin Res Management, Dongming Rd 127,POB 0061, Zhengzhou 450008, Henan, Peoples R China
Henan Canc Hosp, Dongming Rd 127,POB 0061, Zhengzhou 450008, Henan, Peoples R China
Zhengzhou Univ, Sch Publ Hlth, Dept Epidemiol, Zhengzhou 450001, Henan, Peoples R China Zhengzhou Univ, Affiliated Canc Hosp, Dept Clin Res Management, Dongming Rd 127,POB 0061, Zhengzhou 450008, Henan, Peoples R China