- Dr FA Lenz, Department of Neurosurgery, Meyer 7–113, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, MD 21287–7713, USA. Tel: 001 410 955 2257; Fax: 001 410 614 9877.
- Received April 21, 1997
- Revised July 18, 1997
- Accepted July 25, 1997
- First published February 1, 1998.
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