1. Department of Epidemiology and Health Statistics, Fujian Provincial Key Laboratory of Environment Factors and Cancer, School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
2. Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA, USA
3. Yongding Health Inspection Bureau, Longyan City, Fujian Province, China
4. Longyan Health Inspection Bureau, Longyan City, Fujian Province, China
5. State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Public Health, Xiamen University, Xiamen, Fujian, PR China
6. Department of Pediatrics, School of Medicine, Indiana University, Indianapolis, IN, USA
7. Centre for Epidemiology and Evidence-Based Practice, Department of Social and Preventive Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
8. Prenatal Diagnosis Center, Fujian Provincial Maternity andChildren’s Hospital of Fujian Medical University, Fuzhou, Fujian Province, China