1. Department of Neurology, Korea University College of Medicine, Seoul, Korea.
2. Department of Neurology, Dong-A University College of Medicine, Busan, Korea.
3. Department of Neurology, Hallym University College of Medicine, Anyang, Korea.
4. Department of Neurology, Kyung Hee University College of Medicine, Seoul, Korea.
5. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Neurology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
7. Parkinson/Alzheimer Center, Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
8. Department of Neurology, The Catholic University of Korea College of Medicine, Seoul, Korea.
9. Department of Neurology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.