1. Department of Children and Adolescents Health Care, Xinhua Hospital, Shanghai Jiaotong University School of Medicine
2. Shanghai Key Laboratory of Children's Environmental Health, Shanghai 200092
3. Department of Child Health Care, Children's Hospital of Fudan University, Shanghai 200032
4. Shanghai Jiaotong University School of Medicine
5. Department of Epidemiology, Shanghai Jiaotong University School of Public Health, Shanghai 200025
6. Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, Shanghai Jiaotong University School of Medicine, Shanghai 200027, People's Republic of China