1. Clinic of Internal Medicine II, Department of Cardiology, Paracelsus Medical University of Salzburg, Austria
2. Department of Intensive Care, Medisch Centrum Leeuwarden, Leeuwarden, The Netherlands
3. Department of Physiology, Academic Medical Center, University of Amsterdam, The Netherlands
4. Division of Cardiology, Pulmonology, and Vascular Medicine, Medical Faculty, University Duesseldorf, Germany