1 Second Department of Propaedeutic Surgery, Laiko General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
2 National Organization for the Provision of Healthcare Services, Department of Planning and Monitoring of Medicines Dispensing, Medicines Division, Maroussi, Athens, Greece.
3 Department of Visceral Surgery, Basel University Hospital, Basel, Switzerland.
4 Department of Thoracic Surgery, "Attikon" General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.