1. Department of Anesthesiology and Critical Care; University Hospital Wuerzburg; Wuerzburg Germany
2. Institute of Medical Biometry and Statistics; Faculty of Medicine and Medical Center - University of Freiburg; Freiburg Germany
3. Department of Anaesthesiology & Intensive Care Medicine; Philipps-University Marburg; Marburg Germany
4. Department of Anesthesiology; University of Utah; Salt Lake City UT USA
5. Department of Anaesthesiology; University Hospital Düsseldorf; Düsseldorf Germany
6. Department of Anesthesia, Critical Care & Pain Medicine; Beth Israel Deaconess Medical Center, Harvard Medical School; Boston MA USA
7. Department of Anaesthesia, Intensive Care Medicine and Pain Medicine; Queen Elizabeth University Hospital; Glasgow UK
8. Department of Public Health and Infectious Diseases; Sapienza University of Rome; Rome Italy