1 Department of Vascular Medicine, University Heart Centre Hamburg, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany. Electronic address: ch.behrendt@uke.de.
2 Department of Vascular Medicine, University Heart Centre Hamburg, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany.
3 Department of Surgical Sciences, Uppsala University, Uppsala, Sweden.
4 Healthcare Policy and Research, Weill Cornell Medical College, New York, NY, USA.