1. Department of Cardiology, Angiology, and Respiratory Medicine; University of Heidelberg; Im Neuenheimer Feld 410, D-69120 Heidelberg Germany
2. Department of Haematology, Oncology, and Rheumatology; University of Heidelberg; Im Neuenheimer Feld 410, D-69120 Heidelberg Germany
3. Department of Pathology; University of Heidelberg; Im Neuenheimer Feld 220, D-69120 Heidelberg Germany
4. Institute of Management in Healthcare and Welfare; Steinbeis University; Berlin Neufeldstr. 6, D-76456 Kuppenheim Germany