1. College of Computer Science and Electronic Engineering, Hunan University, Changsha, China
2. Department of Ultrasonic Diagnosis, The Second Affiliated Hospital and Yuying Children’s Hospital, Wenzhou Medical University, Wenzhou, China
3. School of Computer Science and Technology, Harbin Institute of Technology, Shenzhen, China
4. Department of Ultrasonography, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China