1. Department of Human Pathology; Gunma University Graduate School of Medicine; Maebashi Gunma Japan
2. Department of Neurosurgery; Gunma University Graduate School of Medicine; Maebashi Gunma Japan
3. Department of Pathology; Gunma University Hospital; Maebashi Gunma Japan
4. Department of Pathology; Hidaka Hospital; Takasaki Gunma Japan