- Dr CM Ellis, Department of Clinical Neurosciences, Institute of Psychiatry, De Crespigny Park, London SE5 8AF, UK. Telephone 0044 171 346 5191; fax 0044 171 346 5190.
- Received May 21, 1998
- Revised January 14, 1999
- Accepted January 28, 1999
- First published July 1, 1999.
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