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. Institute for Medical Psychology, University Medicine Greifswald, Greifswald, Germany;
4. Department of Medical Psychology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
5. Department of Health Economics and Health Services Research, University Medical Center Hamburg-Eppendorf, Hamburg, Germany