1. Department of Angiology, Swiss Cardiovascular Center, Inselspital, University of Bern, Bern, Switzerland
2. Vorarlberg Institute for Vascular Investigation and Treatment, Feldkirch, Austria
3. Department of Medicine and Cardiology, Academic Teaching Hospital Feldkirch, Feldkirch, Austria
4. Private University in the Principality of Liechtenstein, Triesen, Liechtenstein
5. Drexel University College of Medicine, Philadelphia, PA, USA