1. Shi-Jie Guo:
Department of Neonatology, The First Hospital of Jilin University, Changchun 130021, China
2. Dong-Xuan Wang:
Department of Ultrasonic Diagnosis, The First Hospital of Jilin University, Changchun, China
3. Chun-Lai Dai:
Department of Radiology, The First Hospital of Jilin University, Changchun 130021, China
4. Hui Wu:
Department of Neonatology, Hui Wu, MD, Department of Neonatology, The First Hospital of Jilin University, No.71 Xinmin Street, Changchun 130021, China