1. PET/CT Dementia Research Center, Juntendo Tokyo Koto Geriatric Medical CenterJuntendo University School of Medicine 3‐3‐20 Shinsuna Koto‐Ku Tokyo 136‐0075 Japan
2. Department of PsychiatryYokohama Maioka Hospital 3482 Maiokacho, Totsuka‐Ku Yokohama City Kanagawa 244–0813 Japan
3. Department of PsychiatryYokohama City University School of Medicine 3–9 Fukuura, Kanazawa‐Ku Yokohama‐shi Kanagawa 236‐0004 Japan
4. Department of PsychiatryKawasaki Memorial Hospital 20–1 Shiomidai, Miyamae‐Ku Kawasaki City Yokohama Kanagawa 216‐0013 Japan
5. Senior Mental Clinic Nihonbashi Ningyocho 2‐2‐3 Nihonbashi Ningyocho Chuo Tokyo 103‐0013 Japan
6. Department of PsychiatryJuntendo University School of Medicine 2‐1‐1 Hongo Bunkyo‐Ku Tokyo 113–8421 Japan