1 Department for Vascular Medicine (Vascular Surgery, Angiology, Endovascular Care), University Heart & Vascular Centre Hamburg, University Hospital, Hamburg-Eppendorf, Germany. Electronic address: s.debus@uke.de.
2 Department for Vascular Surgery, University Hospital Cologne, Cologne, Germany.
3 Department of Vascular Surgery, Vascular Centre, Krankenhaus Barmherzige Brüder Regensburg, Germany.
4 Department for Vascular Surgery, Niels-Stensen-Kliniken, Marienhospital Osnabrück.