1. Department of Pathology, Graduate School of Medicine, Kyung Hee University, Seoul, Korea.
2. Department of Pathology, Kyung Hee University Medical Center, Seoul, Korea.
3. Department of Pathology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea.
4. Department of Surgery, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea.