1. Clinic for Psychosomatic Medicine and Psychotherapy, University of Duisburg-Essen, LVR-University Hospital Essen , Virchowstr. 174, 45147 Essen , Germany
2. Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University of Duisburg-Essen , Virchowstr. 174, 45147 Essen , Germany
3. Department of Cardiology and Vascular Medicine, West-German Heart and Vascular Center Essen, University Hospital Essen , Hufelandstr. 55, 45122 Essen , Germany