- Correspondence to Professor Jong S Kim, Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Songpa-gu, Seoul 138-736, Republic of South Korea; and Professor Byung-Chul Lee, Department of Neurology, Hallym University Sacred Heart Hospital, Anyang, Republic of South Korea;
- Received 15 July 2017
- Revised 13 September 2017
- Accepted 28 September 2017
- Published online 13 October 2017.