1. Leuven Centre for Algology & Pain Management, University Hospitals Leuven, KU Leuven, Belgium;
2. Department of Medical and Surgical Sciences and Biotechnologies Unit of Anaesthesia, Intensive Care and Pain Medicine, Sapienza University of Rome, Rome, Italy;
3. Royal Hampshire County Hospital, Winchester, UK;
4. Department of Pain Research and Treatment, Jagiellonian University Medical College, Kraków, Poland;
5. Global Pain Initiative, Golden, CO, USA and Naples Anesthesia and Pain Associates, Naples, FL, USA;
6. Hospital de Santo André, Leiria, Portugal;
7. Capio St Görans Hospital, Stockholm, Sweden;
8. Pain Clinic, Departments of Anaesthesiology, Intensive Care, and Pain Medicine, Helsinki University Central Hospital, Helsinki, Finland