1. Anaesthesia Technology Department , King Khalid University—College of Applied Medical Sciences, Khamis Mushait, Asir , Saudi Arabia
2. Epidemiology Group—Institute of Applied Health Sciences , University of Aberdeen—School of Medicine, Medical Sciences and Nutrition, Foresterhill Health Campus, Aberdeen AB25 2ZD , UK
3. Pain AND Opioids after Surgery (PANDOS) Research Group , European Society of Anaesthesiology and Intensive Care, Brussels , Belgium
4. Department of Anaesthesia , NHS Grampian, Aberdeen , UK
5. IMAGINE UR UM 103 , Anesthesia Critical Care, Emergency and Pain Medicine Division, Nîmes University Hospital, Montpellier University, 30900 Nîmes , France