1. Department of Neurology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
2. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
3. Department of Neurology, Yonsei University College of Medicine, Seoul, South Korea
4. Department of Health Sciences and Technology, SAIHST, SungKyunKwan University, Seoul, South Korea
5. Department of Neurology, Pusan National University Hospital, Seoul, South Korea