1. Department of Medical Statistics, Informatics and Health Economics, Innsbruck Medical University, Innsbruck, Austria
2. Agency for Preventive and Social Medicine, Bregenz, Austria
3. Institute of Epidemiology and Medical Biometry, Ulm University, Ulm, Germany
4. Department of Internal Medicine IV (Nephrology and Hypertension), Innsbruck Medical University, Innsbruck, Austria
5. Department of Internal Medicine III (Nephrology and Dialysis), Academic Teaching Hospital Feldkirch, Feldkirch, Austria
6. Vorarlberg Institute for Vascular Investigation and Treatment, Academic Teaching Hospital Feldkirch, Feldkirch, Austria