- Dr Rudolf Töpper, Department of Neurology, Pauwelsstrasse 30, 52057 Aachen, Germany. Telephone 0049 241 8089630; fax 0049 241 8888444.
- Received July 21, 1998
- Revised January 7, 1999
- Accepted January 20, 1999
- First published August 1, 1999.
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