Institution: | aDepartment of Surgical Oncology, Division of Cancer Medicine, Hokkaido University Graduate School of Medicine, Hokkaido, Japan;bDepartment of Pathology, Saitama Medical University, Saitama, Japan;cDepartment of Surgical Pathology, Hokkaido University Hospital, Hokkaido, Japan;dDepartment of Pathology, Saitama Medical University International Medical Center, Saitama, Japan |