1. Department of Physiology, Faculty of Medicine, Gazi University, Ankara, Turkey;
2. Department of Histology and Embryology, Faculty of Medicine, Gazi University, Ankara, Turkey;
3. Department of Physiology, Faculty of Medicine, Lokman Hekim University, Ankara, Turkey;
4. Department of Physiology, Faculty of Medicine, İzmir Katip Çelebi University, İzmir, Turkey