- Dr FA Lenz, Department of Neurosurgery, Meyer Building 7–113, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, MD 21287–7713, USA. Telephone 001 410 955 2257; fax 001 410 614 9877.
- Received December 15, 1998
- Revised April 6, 1998
- Accepted May 13, 1998
- First published November 1, 1998.
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