1. Postgraduate Study Program (MSc) “Cardiopulmonary Resuscitation,” Medical School, National and Kapodistrian University of Athens, Athens, Greece.
2. 4th Department of Internal Medicine, National and Kapodistrian University of Athens, Medical School, Athens, Greece.
3. Hepatogastroenterology Unit, 2nd Department of Internal Medicine-Propaedeutic Research Institute and Diabetes Center, National and Kapodistrian University of Athens, Athens, Greece.
4. Faculty of Medicine, Department of Anesthesiology, University of Thessaly, Larisa, Greece.
5. Department of Biopathology, Medical School, Aretaieio Hospital, National and Kapodistrian University of Athens, Athens, Greece.
6. Department of Physiology and Pathophysiology, School of Medicine, European University Cyprus, Nicosia, Cyprus.