1. Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
2. Clinical Treatment and Follow-up Center for High-risk Newborns of Henan Province, Zhengzhou, China
3. Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
4. Orthopeadics Department, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
5. National Engineering Laboratory for Internet Medical Systems and Applications, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
6. Health Care Department, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.