1. Department of Maternal and Child Health, School of Public Health Sun Yat‐sen University Guangzhou People's Republic of China
2. Department of Radiology Henan Provincial People's Hospital Zhengzhou People's Republic of China
3. Guangzhou Key Laboratory of Environmental Pollution and Health Risk Assessment, Guangdong Provincial Engineering Technology Research Center of Environmental and Health risk Assessment, Department of Occupational and Environmental Health School of Public Health Guangzhou People's Republic of China