- Correspondence to Professor Jin Woo Chang, Department of Neurosurgery, Yonsei University College of Medicine, 205 Seongsanno, Seodaemun-gu Seoul 120–752, Republic of Korea;
- Received January 14, 2014
- Revised April 28, 2014
- Accepted May 7, 2014
- First published May 29, 2014.
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