1. National Institute for Medical Research, Tanga Medical Research Centre Tanga Tanzania
2. Centre for Medical Parasitology, Department of Immunology and Microbiology, University of Copenhagen, Copenhagen and Department of Infectious Diseases, Copenhagen University Hospital (Rigshospitalet) Copenhagen Denmark
3. Department of Biostatistics, Institute of Public Health University of Copenhagen Copenhagen Denmark
4. Malawi University of Science and Technology Thyolo Malawi
5. Department of Clinical Sciences Liverpool School of Tropical Medicine Liverpool UK