- Associate Professor M Abramson, Department of Epidemiology and Preventive Medicine, Monash Medical School, The Alfred Hospital, Prahran, Victoria 3181, Australia.
- Received July 27, 1998
- Revision requested September 11, 1998
- Revised November 25, 1998
- Accepted December 23, 1998
- First published June 1, 1999.
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