affiliation not provided to SSRN, Emory University - Department of Epidemiology, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Huazhong University of Science and Technology - Ministry of Education & Ministry of Environmental Protection, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Zhejiang University - Department of Epidemiology & Bio-Statistics, Saint Louis University - Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology - Institute of Maternal and Child Health and Huazhong University of Science and Technology - Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating)