1. Ziekenhuis Oost‐Limburg, Campus Andre Dumont, Multidisciplinary Pain Unit,
Genk, Belgium;
2. Department of Anesthesiology, Texas Tech University Health Services Center, Lubbock, Texas, USA;
3. Department of Algology, Istanbul Medical Faculty, Istanbul, Turkey;
4. Department of Anesthesiology and Pain Management, University Hospital Maastricht, Maastricht, The Netherlands