*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
Supported by the German Ministry for Education and Research, Berlin, Germany (BMBF, grant number FKZ 01 EM 0113). The authors declare no conflict of interest.
Reprints: Oliver Hirsch, PhD, Department of General Practice/Family Medicine, Philipps University Marburg, D-35032 Marburg, Germany (e-mail: [email protected]).
Received November 30, 2012
Received in revised form January 30, 2014
Accepted January 22, 2014