- Correspondence to: Dr Wakoto Matsuda, Department of Neurosurgery, Tsukuba Medical Centre Hospital, 1-3-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan;
- Received February 17, 2003
- Accepted April 25, 2003
- Revised April 16, 2003
- First published November 14, 2003.
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