1. Department of Gastrointestinal Surgery, Nankai Hospital, Nankai District, Tianjin 300100, China
2. Graduate School of Tianjin Medical University, Nankai District, Tianjin 300100, China
3. Tianjin Institute of Acute Abdominal Disease of Integrated Traditional Chinese and Western Medicine, Nankai District, Tianjin 300100, China
4. Department of Hepatopancreatobiliary Surgery, Nankai Hospital, Nankai District, Tianjin 300100, China