- Professor Michael Schwarz, Neurologische Klinik, Universitätsklinikum der RWTH Aachen, Pauwelsstrasse 30, 52057 Aachen, Germany. Telephone 0049 241 8089625; fax 0049 241 8888444.
- Received March 17, 1998
- Revised August 6, 1998
- Accepted September 22, 1998
- First published March 1, 1999.
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