- Professor J van Gijn, University Department of Neurology, Academic Hospital, Heidelberglaan 100, PO box 85500, 3508 GA Utrecht, The Netherlands. Telephone 0031 30 2507975; fax 0031 30 2542100.
- Received December 2, 1996
- Revised May 23, 1997
- Accepted August 22, 1997
- First published February 1, 1998.
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