- Dr Øystein P Nygaard, Department of Neurosurgery, University Hospital, 9038 Tromsø Norway. Telephone 47 77627091; Fax 47 776 2705; email:
- Received February 10, 1997
- Revised June 2, 1997
- Accepted June 11, 1997
- First published January 1, 1998.
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