1. Departments of Anesthesia & Surgery, Critical Care & Multidisciplinary Pain Management, Valencia University General Hospital, Anesthesia Division, Valencia School of Medicine, Valencia, Spain
2. Department of Anaesthesiology, Intensive Care & Pain Medicine, University Hospital Muenster, Muenster, Germany
3. Erasmus MC, University Hospital, Rotterdam, The Netherlands
4. Brandenburg Medical School Theodor Fontane & Health Services Research, Witten/Herdecke University, Campus Neuruppin, Neuruppin, Germany
5. Department of Anesthesia, Royal Surrey County Hospital, Egerton Road, Royal Surrey, Guildford, UK
6. Faculty of Health & Medical Sciences, Duke of Kent Building, University of Surrey, Guildford, UK