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Ningxia Med Univ, Sch Publ Hlth & Management, Dept Epidemiol & Stat, Yinchuan 750004, Ningxia Hui Aut, Peoples R China
Ningxia Med Univ, Key Lab Environm Factors & Chron Dis Control, Yinchuan 750004, Ningxia Hui Aut, Peoples R China Ningxia Med Univ, Sch Publ Hlth & Management, Dept Epidemiol & Stat, Yinchuan 750004, Ningxia Hui Aut, Peoples R China