1. Department of Zoology and Anthropology, Faculty of Natural Sciences, Constantine the Philosopher University in Nitra, Slovak Republic
2. Private Orthopedic Ambulance, Nitra, Slovak Republic
3. Department of Animal Physiology and Toxicology, Institute of Biology, Faculty of Geography and Biology, Pedagogical University in Cracow, Poland
4. Department of Botany and Genetics, Faculty of Natural Sciences, Constantine the Philosopher University in Nitra, Slovak Republic