1. Shandong Provincial Maternal and Child Health Care Hospital Affiliated to Qingdao University, Jinan, China
2. Department of Paediatrics, Jinan Maternal and Child Health Hospital, Jinan, China
3. Department of Paediatrics, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
4. Department of Paediatrics, Qilu Hospital Affiliated to Shandong University, Jinan, China
5. Department of Paediatrics, Taian Maternal and Child health Care Hospital, Taian, China
6. Department of Paediatrics, Yantai Yuhuangding Hospital, Yantai, China
7. Department of Paediatrics, Hebei PetroChina Central Hospital, Langfang, China
8. Department of Paediatrics, The First Affiliated Hospital of Shandong First Medical University, Jinan China
9. Department of Paediatrics, Wei Fang Maternal and Child Health Hospital, Weifang, China
10. Department of Paediatrics, Liaocheng People's Hospital, Liaocheng, China
11. Department of Paediatrics, Shengli Oilfield Central Hospital, Dongying, China
12. Department of Paediatrics, Baogang Third Hospital of Hongci Group, Baotou, China
13. Department of Paediatrics, Cheeloo College of Medicine, Shandong University, Jinan, China
14. Inspur Electronic Information Industry Co. Ltd, China