1. Department of Neurology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.
2. Korean Sleep Research Society, Seoul, Korea.
3. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
5. Department of Neurology, Dankook University Medical College, Cheonan, Korea.
6. Department of Neurology, Kyung Hee University School of Medicine, Seoul, Korea.
7. Department of Neurology, Gil Medical Center, Gachon University of Medicine and Science, Incheon, Korea.
8. Department of Neurology, Inam Neuroscience Research Center, Sanbon Medical Center, Wonkwang University, Gunpo, Korea.
9. Department of Neurology, Ewha Womans University School of Medicine and Ewha Medical Research Institute, Seoul, Korea.