1 National Center for Geriatrics and Welfare Research, National Health Research Institutes, Miaoli County, Taiwan. Electronic address: kezong@nhri.edu.tw.
2 Department of Neurology and Dementia Center, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan; Department of Neurology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan. Electronic address: chaurjongh@tmu.edu.tw.