1. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
2. Department of General Surgery, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey.
3. Gastric Cancer Center, Yonsei Cancer Center, Seoul, Korea.
4. Open NBI Convergence Technology Research Laboratory, Severance Hospital, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea.