1. Department of Food Safety and Infection Biology, Norwegian University of Life Science, Oslo, Norway
2. Institute of Environmental Sciences, Jagiellonian Uniwersity, Kraków, Poland
3. Department of Zoology and Ecology, University of Agriculture, Kraków, Poland
4. Department of Production Animal Clinical Science, Norwegian University of Life Science, Oslo, Norway
5. Department of Basic Sciences and Aquatic Medicine, Norwegian School of Veterinary Science, Oslo, Norway