1 Department of Cardiovascular Surgery, University Heart Center Freiburg, Faculty of Medicine, University of Freiburg, Germany.
2 Department of Anaesthesiology, Surgical Intensive Care, Emergency Medicine and Pain Therapy, Klinikum Frankfurt Hoechst, Germany; Academic Teaching Hospital of the University of Frankfurt, Germany.
3 Scientific Network SonoABCD at Emergency Department, Klinikum Frankfurt Hoechst, Academic Teaching Hospital of the University of Frankfurt and Dept. of Anaesthesiology, Vulpius Klinik, Bad Rappenau, Academic Teaching Hospital of the University of Heidelberg, Germany. Electronic address: raoul.breitkreutz@gmail.com.