1. Department of Anesthesiology, Intensive Care Medicine and Pain Medicine; University of Saarland; Saarland University Medical Center; Homburg Germany
2. Department of Biostatistics and Medical Informatics; Institute for Epidemiology; University of Saarland; Saarland University Medical Center; Homburg Germany
3. Department of Anesthesiology, Intensive Care and Pain Medicine; Orthopedic University Hospital; Frankfurt Germany
4. Department of Anesthesiology and Intensive Care Therapy; Philipps University Marburg; Marburg Germany
5. Department of Anesthesiology; St. Marien-Krankenhaus Siegen; Siegen Germany
6. Department of Anesthesiology, Intensive Care- and Pain Medicine; Friederikenstift Hannover; Hannover Germany
7. Department of Anesthesia, Intensive and Palliative Care Medicine; Academic Hospital Solingen; Solingen Germany
8. Department of Anesthesiology; Center of Anesthesiology and Intensive Care Medicine; University Medical Center Hamburg-Eppendorf; Hamburg Germany
9. Department of Anesthesiology and Intensive Care; Friedrich-Schiller University Hospital; Jena Germany
10. Department of Anesthesiology, Intensive Care and Pain Therapy; Berufsgenossenschaftliche Unfallklinik; Frankfurt am Main Germany
11. Department of Anesthesiology, Intensive Care and Pain Therapy; University and Rehabilitation Clinics; Ulm Germany
12. Department of Anesthesiology, Intensive Care and Pain Therapy; Carl Gustav Carus University Hospital; Technische Universität Dresden; Dresden Germany
13. Department of Anesthesiology and Operative Intensive Care Medicine; Charité Campus Virchow Klinikum and Campus Mitte; Charité University Medicine Berlin; Berlin Germany