1 Institute of Applied Health Sciences, Epidemiology Group, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK.
2 Department of Anaesthesiology and Intensive Care Medicine, Jena University Hospital, Jena, Germany.
3 Acute Pain Service, Rambam Medical Center, Haifa, Israel.
4 Raymond Poincaré Hospital, Garches, Spain.
5 Department of Anesthesiology, Pain Unit, Hospital de la Santa Creu i Sant Pau Barcelona, Spain.
6 Universitätsklinikum Münster, Münster, Germany.
7 Department of Anaesthesiology and Pain Medicine, Inselspital, Bern University Hospital, Switzerland; Department for BioMedical Research, University of Bern, Bern, Switzerland.
8 Hospital Erasme, Brussels, Belgium.
9 Department of Anesthesiology, Tongde Hospital of Zhejiang Province, Hangzhou, China.
10 Institute of Applied Health Sciences, Epidemiology Group, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK; Department of Anaesthesia, NHS Grampian, Aberdeen, UK; Nimes University Hospital, Nimes, France. Electronic address: forgetpatrice@yahoo.fr.