1. The National Commission of Health Laboratory of Neonatal Diseases, National Children’s Medical Center, Children’s Hospital of Fudan University, Shanghai, China
2. Unit of Population Health Information, Huai’an Women and Children’s Hospital, Huai’an, China
3. Department of Neonatology, Huai’an Women and Children’s Hospital, Huai’an, China
4. Department of Obstetrics, Huai’an Women and Children’s Hospital, Huai’an, China