1. Department of Ultrasound in Medicine, Sixth People’s Hospital Affiliated to Medical College of Shanghai Jiaotong University, Shanghai Institute of Ultrasound in Medicine, Shanghai 200233, China
2. The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 20030, China
3. Department of Medicine in Ultrasound, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai 200072, China