1. Chronic Pain Service; Department of Anesthesia; McGill University Health Center; Montreal Children′s Hospital; Montreal Québec Canada
2. Department of Anesthesia; School of Medicine; Pontifical Catholic University of Chile; Santiago Chile
3. Department of Anesthesia; Clinica Las Condes; Santiago Chile
4. Department of Anesthesia, Perioperative Care and Pain Medicine; New York University School of Medicine; New York New York
5. Department of Anesthesia; McGill University Health Center; Montreal General Hospital; Montreal Québec Canada
6. The Alan Edwards Research Center for Chronic Pain; McGill University; Montreal Québec Canada
7. Alan Edwards Pain Management Unit; McGill University Health Center; Montreal General Hospital; Montreal Québec Canada
8. CIMPARC (Consortium of Multidisciplinary Pain Researchers and Clinicians); Parma Italy