- Dr DQ Beversdorf, Ohio State University Medical Centre, Department of Neurology, 1654 Upham Drive, Columbus, OH 43210, USA. Telephone 001 614 293 8531; fax 001 614 293 4688; email
- Received November 21, 1997
- Revised April 7, 1998
- Accepted May 13, 1998
- First published November 1, 1998.
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