1. Department of Physiology, Pomeranian Medical University in Szczecin, 70-111 Szczecin, Poland
2. Department of Histology and Embryology, Pomeranian Medical University, 70-111 Szczecin, Poland
3. Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, 70-111 Szczecin, Poland
4. Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, 70-111 Szczecin, Poland
5. Institute of Anatomy, Rostock University Medical Center, Gertrudenstrasse 9, 18057 Rostock, Germany