1. Institute of Parasitology, Biology Centre, Czech Academy of Sciences, České Budějovice, Czech Republic
2. Department of Medical Biology, Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic
3. Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
4. Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic