1. Department of Clinical Epidemiology and Medical Technology Assessment; Maastricht University Medical Centre; Maastricht The Netherlands
2. Department of Anesthesiology and Pain Management; Maastricht University Medical Centre; Maastricht The Netherlands
3. Department of Anesthesiology; Critical Care and Multidisciplinary Pain Centre; Ziekenhuis Oost-Limburg; Genk/Lanaken Belgium
4. Multidisciplinary Pain Centre; University Hospital Antwerp; Antwerp Belgium
5. Department of Anesthesiology, Pain and Palliative Medicine; Radboud University Medical Center (Radboudumc); Nijmegen The Netherlands
6. Department of Anesthesiology, Perioperative and Pain Medicine; Brigham Health; Harvard Medical School; Boston Massachusetts U.S.A.