1. Department of Neurology, Pusan National University Hospital, Pusan National University School of Medicine and Medical Research Institute, Busan, Korea.
2. Ilsong Institute of Life Science, Hallym University, Anyang, Korea.
3. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Memory and Aging Center, Department of Neurology, University of California, San Francisco, San Francisco, USA.