1. Department of Psychosomatic Medicine and Psychotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany2Schön Clinic Hamburg Eilbek, Hamburg, Germany
2. Department of Medicine, Indiana University, Indianapolis4Veterans Affairs Health Services Research and Development Service, Center for Health Information and Communication, Indianapolis, Indiana5Regenstrief Institute, Inc, Indianapolis, Indiana
3. Department of Medical Psychology and Medical Sociology, University of Leipzig, Leipzig, Germany