1. Department of Organ Pathology, Faculty of Medicine, Shimane University, 89-1 Enya, Izumo 693-8501, Japan
2. Pathology Division, Shimane University Hospital, Izumo 693-8501, Japan
3. Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
4. Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Japan