- Dr Blair Ford, Neurological Institute, Columbia College of Physicians, 710 West 168th Street, New York 10032, USA. Telephone 001 212 305 5548; fax 001 212 305 1304; email
- Received December 18, 1997
- Revised March 11, 1998
- Accepted March 19, 1998
- First published October 1, 1998.
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