Huazhong University of Science and Technology - Department of Occupational & Environmental Health, Huazhong University of Science and Technology, Huazhong University of Science and Technology, Huazhong University of Science and Technology - Department of Occupational & Environmental Health, Tsinghua University, Maternal and Child Health Care Service Centre of Xiaonan District, Maternal and Child Health Care Service Centre of Xiaonan District, Huazhong University of Science and Technology - Department of Occupational & Environmental Health, Tsinghua University, Huazhong University of Science and Technology, Center for Public Health and Environmental Assessment and Tsinghua University