- Dr Hugh Markus, Department of Neurology, Institute of Psychiatry, De Crespigny Park, London SE5 8AF, UK. Telephone 0044 171 9193407; fax 0044 171 7039989; email
- Received April 9, 1997
- Revised July 10, 1997
- Accepted August 5, 1997
- First published January 1, 1998.
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