- Dr Ralf W Baumgartner, Department of Neurology, University Hospital, Frauenklinikstrasse 26, CH-8091 Zurich, Switzerland. Telephone 0041 1 255 56 86; fax 0041 1 255 43 80; email
- Received December 30, 1997
- Revised March 13, 1998
- Accepted March 19, 1998
- First published October 1, 1998.
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