- Professor Michael Swash, Neurological Department, The Royal London Hospital, London E1 1BB, UK. Telephone 0044 171 377 7472; fax 0044 171 377 7008.
- Received April 9, 1997
- Revised July 11, 1997
- Accepted July 25, 1997
- First published January 1, 1998.
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