- Correspondance to: Dr Nils Koch-Henriksen, Department of Neurology, Aalborg Hospital North, DK-9100 Aalborg, Denmark. Fax: 0045 99 32 19 58; email:
- Received October 20, 1997
- Revised January 5, 1998
- Accepted January 13, 1998
- First published July 1, 1998.
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