1 Laboratory of Physiology, Department of Physiology and Pharmacology, Faculty of Medicine, School of Health Sciences, Aristotle University of Thessaloniki (A.U.Th), University Campus, 54124 Thessaloniki, Greece. Electronic address: vavilis@auth.gr.
2 Laboratory of Physiology, Department of Physiology and Pharmacology, Faculty of Medicine, School of Health Sciences, Aristotle University of Thessaloniki (A.U.Th), University Campus, 54124 Thessaloniki, Greece. Electronic address: kritis@med.auth.gr.