- Dr Dagmar Timmann, Department of Neurology, University of Essen, Hufelandstraβe 55, 45122 Essen, Germany. Telephone 0049 201 723 2460; fax 009 201 723 5901; email
- Received December 15, 1997
- Revised April 20, 1998
- Accepted April 23, 1998
- First published November 1, 1998.
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