1. Department of Diagnostics and Clinical Sciences, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
2. Department of Anatomy, Poznan University of Medical Sciences, 61-701 Poznan, Poland
3. Department of Veterinary Surgery, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
4. Department of Toxicology, Poznan University of Medical Sciences, 61-701 Poznan, Poland
5. Department of Basic and Preclinical Sciences, Institute of Veterinary Medicine, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
6. Physiology Graduate Faculty, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, NC 27695, USA
7. Division of Anatomy, Department of Human Morphology and Embryology, Wroclaw Medical University, 50-367 Wroclaw, Poland
8. Center of Assisted Reproduction, Department of Obstetrics and Gynecology, University Hospital and Masaryk University, 601 77 Brno, Czech Republic