- Professor A Ferbert, Neurologische Klinik, Städt Kliniken Kassel, Mönchebergstrasse 41–43, 34125 Kassel; Germany. Tel: 0049 561 980 3400; Fax: 0049 561 980 6979.
- Received February 14, 1997
- Revised November 6, 1997
- Accepted November 28, 1997
- First published July 1, 1998.
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