Affiliation: | aUniversity of Antwerp, Department of Biology, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium bNational Institute for Public Health and the Environment, Antonie van Leeuwenhoeklaan 9, P.O. Box 1, 3720 BA Bilthoven, The Netherlands cScientific Institute of Public Health, Rue Juliette Wytsman 14, B-1050 Brussel, Belgium dUniversité de Liège, Département de Parasitologie et Pathologie des Maladies Parasitaires, Boulevard de Colonster 20, B-4000 Liège, Belgium |