1. 1 Division of Anatomy, Department of Human Morphology and Embryology, Faculty of Medicine , Wroclaw Medical University , Wroclaw , Poland
2. 2 2nd Department of General Surgery and Surgical Oncology , Medical University Hospital , Wroclaw , Poland
3. 3 Prestage Department of Poultry Sciences , North Carolina State University, Raleigh , North Carolina , USA
4. 4 Graduate Physiology Program NC State University North Carolina State University , Raleigh, North Carolina , USA