1. Department of Pathology, Research Institute for Medical Sciences, Chungnam National University School of Medicine, Daejeon, Korea.
2. Department of Surgery, Chungnam National University School of Medicine, Daejeon, Korea.
3. Department of Pathology, Catholic University Daejeon St. Mary's Hospital, Daejeon, Korea.
4. Department of Pathology, Eulji Hospital, Daejeon, Korea.