1. W. Stefański Institute of Parasitology of the Polish Academy of Sciences, Warsaw, Poland
2. Institute of Parasitology, Slovak Academy of Sciences, Košice, Slovakia
3. Department of General Biology and Parasitology, Medical University of Warsaw, Warsaw, Poland
4. Department of Systematic Zoology, Institute of Environmental Biology, Faculty of Biology, Adam Mickiewicz University, Poznań, Umultowska, Poland