1. Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China
2. Department of Gastrointestinal Surgery, Nanchong Central Hospital, the Second Clinical Institute of North Sichuan Medical College, Nanchong, Sichuan, China
3. Department of Medical Imaging, Nanchong Central Hospital, the Second Clinical Institute of North Sichuan Medical College, Nanchong, Sichuan, China