title: Response to letter to the editor.
authors: National Competence Centre for Complex Symptom Disorders, St. Olav's University Hospital, Trondheim, Norway Clinical Neuroscience Research Group, Department of Psychology, University of Oslo, Oslo, Norway Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway Department of Psychiatry, St Olav's University Hospital, Trondheim, Norway Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway Department of Anaesthesia and Emergency Medicine, St. Olav's University Hospital, Trondheim, Norway.
authors: Nils I
authors: NI
authors: Landrø
authors: Egil A
authors: EA
authors: Fors
authors: Lindis L
authors: LL
authors: Våpenstad
authors: Øyvor
authors: Ø
authors: Holthe
authors: Tore C
authors: TC
authors: Stiles
authors: Petter C
authors: PC
authors: Borchgrevink
mesh_terms: D000701:Analgesics, Opioid / Q000627:therapeutic use*; D059350:Chronic Pain / Q000175:diagnosis* / Q000188:drug therapy*; D003072:Cognition Disorders / Q000175:diagnosis*; D003863:Depression / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests / Q000706:statistics & numerical data*; D018710:Pain Clinics / Q000706:statistics & numerical data*
chemical_list: D000701:Analgesics, Opioid