1. Department of Gastrointestinal Surgery & Laboratory of Gastric Cancer, West China Hospital, Sichuan University, Chengdu, China
2. Department of Gastroenterology, Nursing Section, West China Hospital, Sichuan University, Chengdu, China
3. Department of Gastrointestinal and Hernia Surgery, the Second People’s Hospital of Yibin City, West China Yibin Hospital, Sichuan University, Yibin, China
4. Department of General Surgery, the First People’s Hospital of Longquanyi District, West China Longquan Hospital, Sichuan University, Chengdu, China