- Correspondence to Dr Sungwook Yu, Department of Neurology, Korea University College of Medicine, #126-1, Anam-Dong 5-Ga, Seongbuk-Gu, Seoul 136-705, Republic of Korea;
- Received January 24, 2013
- Revised February 24, 2013
- Accepted February 27, 2013
- First published March 26, 2013.
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