1. Department of Abdominal Ultrasonography, The First Affiliated Hospital of Harbin Medical University, Harbin, China.
2. Department of Ultrasonic Imaging, First Hospital of Shanxi Medical University, Taiyuan, China.
3. Institute of Cancer Prevention and Treatment, Harbin Medical University, Harbin, China.
4. Department of Pain Management, The First Affiliated Hospital of Harbin Medical University, Harbin, China.