1. National and Kapodistrian University of Athens, Faculty of Medicine, Vassilisis Sofias Avenue 72, Athens, 11527, Greece
2. National and Kapodistrian University of Athens Aiginitio Hospital, Athens, Greece
3. National and Kapodistrian University of Athens, Athinon, Greece
4. ‘St. Panteleimon’ General State Hospital of Piraeus, Athens, Greece
5. Red Cross Hospital, Athens, Greece