1. Department of Neurology, College of Medicine; Ewha Womans University; Seoul Korea
2. Department of Neurology; Dongtan Sacred Heart Hospital, Hallym University College of Medicine; Hwaseong Korea
3. Department of Neurology; Gangnam Severance Hospital, Yonsei University; College of Medicine; Seoul Korea
4. Department of Neurology; Soonchunhyang University College of Medicine, Cheonan Hospital; Cheonan Korea
5. Bundang Clinical Neuroscience Center, Department of Neurology; Seoul National University Hospital; Seongnam Korea
6. Department of Neurology; Severance Hospital, Yonsei University College of Medicine; Seoul Korea