1. Department of Surgery, Division of Colorectal Surgery, Yonsei University College of Medicine, Severance Hospital, Seoul 03722, Republic of Korea
2. Department of Pediatrics, Division of Pediatric Hemato‑Oncology, Yonsei University College of Medicine, Severance Hospital, Seoul 03722, Republic of Korea
3. Department of Pathology, Yonsei University College of Medicine, Severance Hospital, Seoul 03722, Republic of Korea