1. Department of Anaesthesiology and Intensive Care; University of Leipzig Medical Center; Leipzig Germany
2. Department of Anesthesiology; University Medical Center Göttingen, Georg August University; Göttingen Germany
3. Cochrane Haematology, Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany
4. Institute of General Practice; Medical Faculty of the Heinrich-Heine-University Düsseldorf; Düsseldorf Germany
5. Department of Infectious Diseases and Respiratory Medicine; Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin; Berlin Germany
6. Department of Intensive Care Medicine; Medical Center Hamburg Eppendorf (UKE); Hamburg Germany
7. Cochrane Cancer, Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf; Faculty of Medicine and University Hospital Cologne, University of Cologne; Cologne Germany