1 Department of Gastroenterology, Nursing Section, West China Hospital, Sichuan University, Chengdu, China.
2 Department of Gastrointestinal Surgery & Gastric Cancer Laboratory, West China Hospital, Sichuan University, Chengdu, China.
3 Department of Gastrointestinal and Hernia Surgery, Second People's Hospital of Yibin City-West China Yibin Hospital, Sichuan University, Yibin, China.