- Dr Katja Pietz, Department of Neurology, Medical School, Hannover, D-30623 Hannover, Germany. Telephone 0049 511 532 3580; fax 0049 511 532 3115.
- Received February 25, 1997
- Revised May 6, 1998
- Accepted June 15, 1998
- First published November 1, 1998.
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