1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2. College of Computer Science, Nankai University, Tianjin 300071, China
3. Department of Family Planning, The Second Hospital of Tianjin Medical University, Tianjin 300211, China
4. Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington 98105, United States
5. Department of Civil and Environmental Engineering, University of Washington, Seattle, Washington 98195, United States