1. Department of Psychosomatic Medicine and Psychotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
2. Department of Nursing and Management, Hamburg University of Applied Sciences, Hamburg, Germany
3. Clinic for General Internal Medicine and Psychosomatics, University Medical Center Heidelberg, Germany
4. Institute for Social Medicine and Health Systems Research, Medical Faculty, Otto-von-Guericke University Magdeburg, Germany