1. Department of Cardiovascular Medicine, Nephrology and Neurology, University of the Ryukyus, Okinawa, Japan
2. Clinical Laboratories, University of the Ryukyus Hospital, Okinawa, Japan
3. Department of Human Welfare, Okinawa International University, Okinawa, Japan
4. Department of Geriatric Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu, USA
5. Department of Neurology and Layton Aging & Alzheimer’s Disease Center, Oregon Health & Science University, Portland, OR, USA
6. Department of Neurology and Michigan Alzheimer’s Disease Center, University of Michigan, Ann Arbor, MI, USA