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. Department of Biostatistics and Medical Informatics, Institute of Medical Science, Karadeniz Technical University, Trabzon, Turkey.
4. Open NBI Convergence Technology Research Laboratory, Severance Hospital, Yonsei University Health System, Seoul, Korea.
5. Gastric Cancer Center, Yonsei Cancer Hospital; Seoul, Korea.