1. Department of Gastroenterology, Nursing Section, West China Hospital Sichuan University Chengdu China
2. Gastric Cancer Center & Gastric Cancer Laboratory, Department of General Surgery, West China Hospital Sichuan University Chengdu China
3. Department of Gastrointestinal Surgery, Ya'an Cancer Prevention and Control Center, Ya'an People's Hospital ‐ West China Ya'an Hospital Sichuan University Ya'an China