1. Department of Surgical Intensive Care; University Hospital RWTH Aachen; Aachen Germany
2. Clinical Trials Unit; Medical Center - University of Freiburg; Freiburg Germany
3. Department of Infection Control and Infectious Diseases; University Hospital RWTH Aachen; Aachen Germany
4. Department of Cardiology, Pneumology, Angiology and Intensive Care Medicine; University Hospital RWTH Aachen; Aachen Germany