1. Department of Psychology, University of Potsdam, Potsdam, Germany, 2Institute of Psychology, Health Psychology, University of Ulm, Ulm, Germany, 3Biological Psychology and Neuroergonomics, Technical University of Berlin, Berlin, Germany and 4Department of Psychosomatic Medicine and Psychotherapy, University Hospital of Tuebingen, Eberhard-Karls-University, Tuebingen, Germany