1. Department of Neurology, Sleep Medicine Research Center, College of Medicine, Catholic Kwandong University, International St. Mary’s Hospital, Incheon, Korea
2. Department of Neurology, Keimyung University School of Medicine, Daegu, Korea
3. Department of Neurology, School of Medicine, Kyunghee University, Seoul, Korea
4. Department of Neurology, Sleep Disorders Center, Soonchunhyang University College of Medicine, Cheonan Hospital, Cheonan, Korea
5. Department of Urology, Keimyung University School of Medicine, Daegu, Korea