1. Department of Anaesthesiology; University Medical Centre; Georg August University of Göttingen; Göttingen Germany
2. Section “Acute Pain”; German Pain Society; Berlin Germany
3. Section “Pain Medicine”; German Society of Anaesthesiology and Intensive Care; Nürnberg Germany
4. Department of Anaesthesiology and Pain Medicine; Inselspital and Department of Clinical Research; University of Bern; Bern Switzerland
5. Department of Anaesthesiology and Intensive Care Medicine; Jena University Hospital; Jena Germany