- Correspondence to Professor P H Lee, Department of Neurology, Yonsei University Medical College, 250 Seongsanno, Seodaemun-gu, Seoul 120–752, South Korea;
- Received January 28, 2013
- Revised April 9, 2013
- Accepted May 13, 2013
- First published July 4, 2013.
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