1. London School of Hygiene and Tropical Medicine, Department of Medical Parasitology, London, UK,
2. Department of Infectious Diseases and Tropical Medicine, University of Munich, Germany,
3. Centre of Medical Parasitology, Unit of Tropical Medicine, Department of Infectious Diseases, State University Hospital, Rigshospitalet, Copenhagen, Denmark,
4. National Institute for Medical Research, Amani Research Centre, Amani, Tanzania