1. Department of Morphological Sciences; Faculty of Veterinary Medicine; Warsaw University of Life Sciences - SGGW; Nowoursynowska 159 02-776 Warsaw Poland
2. Department of Animal Physiology and Biostructure; Faculty of Veterinary Medicine; Wroclaw University of Environmental and Life Sciences; Kozuchowska 1/3 51-631 Wroclaw Poland
3. Institute of Veterinary Anatomy; Faculty of Veterinary Medicine; Freie Universität Berlin; Koserstrasse 20 14195 Berlin Germany