1. Center of Gastric Cancer, West China Hospital, Sichuan University, Chengdu, China
2. Department of Gastrointestinal Surgery, Yibin Second People’s Hospital, Yibin, China
3. Department of General Surgery, Suining Municipal Hospital of Traditional Chinese Medicine, Suining, China
4. Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu, China