1 German Resuscitation Council (GRC), Ulm, Germany; Department of Anaesthesiology and Intensive Care Medicine, Medical Faculty and University Hospital of Cologne, Kerpener Str. 62, 50937 Cologne, Germany.
2 German Resuscitation Council (GRC), Ulm, Germany; Department of Cardiology and Intensive Care Medicine, St. Bernward Hospital, Treibestr. 9, 31134 Hildesheim, Germany.
3 German Resuscitation Council (GRC), Ulm, Germany; Department of Emergency Medicine, Faculty of Medicine, University Hospital of Freiburg, University of Freiburg, Freiburg, Germany.
4 Department of Internal Medicine III (Cardiology, Angiology and Intensive Care Medicine), University of Kiel/UKSH, Campus Kiel, Arnold Heller-Str. 6, 24105 Kiel, Germany.
5 Department of Internal Medicine, Division of Cardiology, Pulmology, Vascular Diseases, Heinrich Heine University Hospital, Moorenstr 5, 40225 Düsseldorf, Germany.
6 Heart Center Leipzig at University of Leipzig, Department of Internal Medicine/Cardiology, Strümpellstr. 39, 04289 Leipzig, Germany.
7 German Resuscitation Council (GRC), Ulm, Germany; Department of Anaesthesiology and Intensive Care Medicine, Medical Faculty and University Hospital of Cologne, Kerpener Str. 62, 50937 Cologne, Germany. Electronic address: bernd.boettiger@uk-koeln.de.