- Dr J Y Ahn, Department of Neurosurgery, Yongdong Severance Hospital, 146–92, Dogok-dong, Kangnam-gu, Seoul, 135–720, Republic of Korea;
- Received March 11, 2007
- Revised June 6, 2007
- Accepted June 7, 2007
- First published November 16, 2007.
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