- Dr U Roelcke, Department of Neurology, Cantonal Hospital, 5001 Aarau, Switzerland. Telephone 0041 62 838 5682; fax 0041 62 838 6674.
- Received December 30, 1997
- Revised August 5, 1998
- Accepted October 29, 1998
- First published May 1, 1999.
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