1. National Radiation Emergency Medical Center, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences (KIRAMS), Seoul 139–706, Republic of Korea;
2. Laboratory of Experimental Pathology, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences (KIRAMS), Seoul 139–706, Republic of Korea;
3. Department of Surgery, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences (KIRAMS), Seoul 139–706, Republic of Korea;
4. Department of Internal Medicine, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences (KIRAMS), Seoul 139–706, Republic of Korea;
5. Department of Surgery, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 143–729, Republic of Korea; and
6. Department of Histology, College of Veterinary Medicine, Kangwon National, University, Gangwon-do 200–701, Republic of Korea