1 Clinic of Angiology, University Hospital Zurich, Rämistrasse 100, RAE C 04, 8091 Zurich, Switzerland; Center for Thrombosis and Hemostasis, University Medical Center Mainz, Mainz, Germany. Electronic address: stefano.barco@usz.ch.
2 Clinic of Angiology, University Hospital Zurich, Rämistrasse 100, RAE C 04, 8091 Zurich, Switzerland.