1. Kintampo Health Research Centre, Research and Development Division, Ghana Health Service, Kintampo P.O. Box 200, Ghana
2. Public Health Consultant, 1202 Geneva, Switzerland
3. Ghana Country Office, World Health Organization, Accra P.O. Box MB 142, Ghana
4. Council for Scientific and Industrial Research-Animal Research Institute, Accra P.O Box 20, Ghana
5. International Union Against Tuberculosis and Lung Diseases, 75006 Paris, France