1. Department of Cardiovascular Surgery; Heart Center; University of Freiburg; Freiburg Germany
2. Department of Psychosomatic Medicine and Psychotherapy; Medical Center; University of Freiburg; Freiburg Germany
3. Institute of Psychology; University of Freiburg; Freiburg Germany
4. Quality and Development in Nursing Care; Medical Center; University of Freiburg; Freiburg Germany