1. Department of Pathology, Inha University Hospital, Inha University School of Medicine, Incheon, Korea.
2. Department of Surgery, Inha University Hospital, Inha University School of Medicine, Incheon, Korea.
3. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Pathology, Gachon University of Medicine and Science, Incheon, Korea.