Department of Physiology, Medical School, National and Kapodistrian University of Athens, Athens 11527, Greece.Department of Physiology, Medical School, National and Kapodistrian University of Athens, Athens 11527, Greece.Institute for Clinical Chemistry and Laboratory Medicine, University Hospital and Faculty of Medicine Carl Gustav Carus of TU Dresden, Dresden 01307, Germany.Department of Physiology, Medical School, National and Kapodistrian University of Athens, Athens 11527, Greece.Department of Physiology, Medical School, National and Kapodistrian University of Athens, Athens 11527, Greece.Department of Physiology, Medical School, National and Kapodistrian University of Athens, Athens 11527, Greece.