1. Department of Periodontology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
2. Department of Oral Anatomy and Cell Biology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
3. Department of Immunology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
4. Department of Neurology and Geriatric Medicine, Ehime University Graduate School of Medicine, Ehime, Japan
5. Department of Neurocognitive Science, Institute of Brain Science, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
6. Laboratory for Proteolytic Neuroscience, RIKEN Center for Brain Science, Wako, Japan