1. Department of Gastrointestinal Surgery; The Second Affiliated Hospital of Chongqing Medical University; Chongqing China
2. Division of Psychiatry and Applied Psychology, School of Medicine; University of Nottingham; Nottingham UK
3. Department of Hepatobiliary Surgery; Union Hospital, Tongji Medical College, Huazhong University of Science and Technology; Wuhan China
4. Department of Upper GI Surgery; Ashford and St Peter's NHS Trust; Chertsey UK
5. School of Public Health, Tongji Medical College; Huazhong University of Science and Technology; Wuhan China