University Centre for Vascular Medicine, University Clinic Carl Gustav Carus, Technische Universität Dresden, Germany; College of Medicine and Public Health, Flinders University and Flinders Medical Centre, Adelaide, Australia. Research Group GermanVasc, Department of Vascular Medicine, University Heart and Vascular Centre UKE Hamburg, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany. BARMER, Wuppertal, Germany. University Centre for Vascular Medicine, University Clinic Carl Gustav Carus, Technische Universität Dresden, Germany; Clinical Sensoring and Monitoring, Department of Anaesthetics and Intensive Care Medicine, University Clinic Carl Gustav Carus, Technische Universität Dresden, Germany. Research Group GermanVasc, Department of Vascular Medicine, University Heart and Vascular Centre UKE Hamburg, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany. Electronic address: behrendt@hamburg.de.