1. Department of General Surgery, The Affiliated Hospital of Nantong University, Jiangsu Province 226001, China
2. Medical College of Nantong University, Nantong, Jiangsu Province 226001, China
3. Department of Ultrasound, The Affiliated Hospital of Nantong University, Jiangsu Province 226001, China
4. Department of General Surgery, Huaian Hospital of Huaian City, Jiangsu Province 223200, China