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