1. Vascular Unit—2nd Clinic of Surgery–Medical School, National and Kapodistrian University of Athens, Aretaieion University Hospital, Athens, Greece
2. 2nd Clinic of Surgery–Medical School, National and Kapodistrian University of Athens Aretaieion University Hospital, Athens, Greece
3. Radiology Department, St Bartholomew’s Hospital, London, United Kingdom
4. ENT Clinic of Red Cross Hospital, Athens, Greece