1. Department of Surgery, Seoul National University Hospital, Seoul, Korea.
2. Department of Gastrointestinal Surgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
3. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Cancer Research Institute, Seoul National University, Seoul, Korea.
5. Department of Surgery, Gachon University Gil Medical Center, Incheon, Korea.
6. Division of Foregut Surgery, Department of Surgery, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
7. Department of Surgery, Eulji University, Seoul, Korea.
8. Department of Surgery, Al-Noor Specialist Hospital, Makkah, Saudi Arabia.
9. Department of Surgery, Taif University, College of Medicine, Taif, Saudi Arabia.