1. Department of General Internal Medicine and Psychosomatics , University of Heidelberg , Im Neuenheimer Feld 410, D-69120 Heidelberg , Germany
2. Institute of Medical Psychology and Medical Sociology, University Medical Center Schleswig-Holstein, Kiel University , Preußerstraße 1-9, 24105 Kiel , Germany
3. Department of Child and Adolescent Psychiatry and Psychotherapy and Institute of Cognitive and Clinical Neuroscience , Central Institute of Mental Health , Medical Faculty Mannheim , Heidelberg University , Square J 5, 68159 Mannheim , Germany