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Cent South Univ, Xiangya Sch Publ Hlth, Dept Epidemiol & Hlth Stat, 172 Tongzipo Rd, Changsha 410013, Hunan, Peoples R China
Hunan Prov Maternal & Child Hlth Care Hosp, NHC Key Lab Birth Defect Res & Prevent, Changsha, Hunan, Peoples R China
Hunan Prov Key Lab Clin Epidemiol, Changsha, Hunan, Peoples R China Cent South Univ, Xiangya Sch Publ Hlth, Dept Epidemiol & Hlth Stat, 172 Tongzipo Rd, Changsha 410013, Hunan, Peoples R China