1. First Department of Cardiology, School of Medicine, National and Kapodistrian University of Athens, Hippokration General Hospital, Athens, Greece
2. Department of Nephrology and Hypertension, University Hospital Erlangen, Friedrich Alexander University Erlangen Nürnberg, Erlangen, Germany (R.E.S)
3. Medizinische Klinik II, Sana Kliniken Lübeck GmbH, Lübeck, Germany