1. Department of Growth and DevelopmentCapital Institute of PediatricsBeijing China
2. Capital Institute of PediatricsBeijing China
3. Beijing Maternal and Child Health Care HospitalBeijing China
4. Harbin Maternal and Child Health Care HospitalHarbin China
5. Xi'an Maternal and Child Health Care HospitalXi'an China
6. Shanghai Maternal and Child Health Care CenterShanghai China
7. Nanjing Maternal and Child Health Care HospitalNanjing China
8. Wuhan Maternal and Child Health Care HospitalWuhan China
9. Guangzhou Women and Children's Medical CenterGuangzhou China
10. Fuzhou Maternal and Child Health Care HospitalFuzhou China
11. Kunming Municiple Women and Children Health Care CenterKunming China
12. Department of Scientific and ResearchCapital Institute of PediatricsBeijing China