- Dr R S Heyderman, Department of Infection and Tropical Medicine, Imperial College School of Medicine, Northwick Park Hospital, Harrow, Middlesex HA1 3UJ, UK.
- Received April 7, 1997
- Revision requested June 17, 1997
- Revised September 17, 1997
- Accepted November 5, 1997
- First published May 1, 1998.
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