1. Department of Epidemiology and Disease Control, School of Public Health, University of Ghana, PO Box LG13, Legon, Ghana.
2. School of Social and Political Sciences, University of Glasgow, Glasgow, Scotland.
3. Department of Microbiology, Centre for Plant Medicine Research, Mampong, Ghana.
4. Department of Parasitology, University of Ghana, Legon, Ghana.
5. School of Biomedical and Allied Health Sciences, University of Ghana, Accra, Ghana.
6. Centre for Reviews and Dissemination, University of York, York, England.
7. Health Planning Service, Regional Health Authority of Umbria, Perugia, Italy.
8. Department of Public Health, Erasmus University Medical Centre Rotterdam, Rotterdam, Netherlands.