- Dr J H P van der Meulen, London School of Hygiene and Tropical Medicine, Department of Public Health and Policy, Health Services Research Unit, Keppel Street, London WC1E 7HT, UK email:
- Received November 4, 1999
- Revision requested January 6, 2000
- Revised February 22, 2000
- Accepted March 20, 2000
- First published July 1, 2000.
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