1. 1 Institute of Parasitology of Slovak Academy of Sciences , 040 01 Košice , Slovak Republic
2. 2 Department of Parasitology, I. I. Schmalhausen Institute of Zoology NAS of Ukraine , 01054 Kyiv , Ukraine
3. 3 Department of Zoology and Animal Welfare, University of Agriculture in Krakow , 31-120 Kraków , Poland