1. Ministry of Education Key Laboratory of Environment and Health, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College Huazhong University of Science and Technology No. 13 Hangkong Road Wuhan 430030 China
2. Department of Maternal and Child Health, School of Public Health, Tongji Medical College Huazhong University of Science and Technology Wuhan China
3. Department of Cardiology Kailuan Hospital, North China University of Science and Technology No. 57 Xinhua East Road Tangshan City 063001 China