1. Section Clinical Tropical Medicine; Heidelberg University Hospital; Heidelberg Germany
2. Institute of Parasitology; University of Bern; Bern Switzerland
3. Graduate School for Cellular and Biomedical Sciences; University of Bern; Bern Switzerland
4. Department of Clinical Biology B; Laboratory of Parasitology and Mycology; University of Monastir; Monastir Tunisia
5. Instituto de Recursos Naturales y Agrobiología de Salamanca; Consejo Superior de Investigaciones Científicas; Salamanca Spain
6. Institute of Social and Preventive Medicine; University of Bern; Bern Switzerland