1. Department of Surgery, Cheil General Hospital & Women's Health Care Center, Catholic Kwandong University College of Medicine, Seoul, Korea.
2. Department of Pathology, CHA Gangnam Medical Center, CHA University, Seoul, Korea.
3. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Anatomy, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.