Clin J Pain 2014 Dec;30(12):1023-32
*Department of General Practice/Family Medicine **Institute for Medical Psychology, University of Marburg, Marburg †Institute of Medical Informatics, Biometry and Epidemiology, Ludwig-Maximilians-Universität, Munich ‡Institute of Genetic Epidemiology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg §University Hospital of Düsseldorf, Institute for General Practice, Düsseldorf ∥University Hospital of Cologne, Institute for Health Economics and Clinical Epidemiology, Cologne ¶Department of General Practice, Institute for Community University Medicine Greifswald, Greifswald Departments of #General Practice/Family Medicine ‡‡Anaesthesiology, Pain Clinic, University of Göttingen, Göttingen, Germany ††Department of Public Health Sciences, University of Hawaii at Manoa, HI.