1. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea..
2. Gastric Cancer Center, Yonsei Cancer Center, Seoul, Korea.
3. Open NBI Convergence Technology Research Laboratory, Severance Hospital, Seoul, Korea.
4. Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
5. Department of Medical Biophysics, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.