1. Department of Ultrasound Diagnostics, The First People's Hospital of Taicang, Taicang 215400, P. R. China
2. Department of Ultrasound Diagnostics, The First Affiliated Hospital of Nanjing Medical University, Nanjing Jiangsu
210029, P. R. China
3. Department of Ultrasound Diagnostics, Jinling Hospital, School of Medicine, Nanjing University,
Nanjing 210002, P. R. China