1. The Research Clinic for Functional Disorders and Psychosomatics; Aarhus University Hospital; Aarhus; Denmark
2. Nordic Institute of Chiropractic and Clinical Biomechanics; The Back Research Center; Odense University Hospital; Ringe; Denmark
3. Department of Neurology; Aarhus University Hospital; Aarhus; Denmark
4. Danish Pain Research Center; Aarhus University Hospital; Aarhus; Denmark