Department of Surgery and Cancer Research Institute,Seoul-National University College of Medicine,Seoul 110-744,Korea;
Department of Surgery,Ewha Woman's University College of Medicine,Seoul,Korea;
Department of Pathology,Seoul National University College of Medicine,Seoul,Korea;
Department of Surgery and Cancer Research Institute,Seoul National University College of Medicine,Seoul 110-744,Korea;
Department of Surgery,Seoul National University College of Medicine,Seoul,Korea;