1 Department of Cardiology, Pneumonology and Intensive Care Medicine, Clinic for Internal Medicine I, University Hospital Jena, Friedrich-Schiller-University, Jena, Germany.
2 Department of Cardiology, Charité, University Medicine Berlin, Campus Virchow, Berlin, Germany.
3 Berlin-Brandenburg Center for Regenerative Therapies, Charité, University Medicine Berlin, Campus Virchow, Berlin, Germany.