1. Department of Health Services, School of Public Health and Community Medicine, PO Box 357660, University of Washington, Seattle, Washington 98195, USA.
2. Ministry of Health, Maputo, Mozambique.
3. Health Alliance International, Chimoio, Mozambique.
4. Health Alliance International, Seattle, Washington, USA.
5. National Malaria Control Programme, Ministry of Health, Maputo, Mozambique.
6. Department of Epidemiology, School of Public Health and Community Medicine, University of Washington, Seattle, Washington, USA.