- Dr F A Lenz, Department of Neurosurgery, Meyer Building 7–113, Johns Hopkins Hospital, North Wolfe Street, Baltimore, MD 21287–7713, USA. Telephone 001 410 955 2257; fax 001 410 614 9877; email
- Received July 20, 1998
- Accepted November 3, 1998
- First published June 1, 1999.
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