1. Department of Psychosomatics and Psychotherapy, University Hospital Cologne, Faculty of Medicine University of Cologne Cologne Germany
2. Department of Social Policy and Methods of Qualitative Social Research, Faculty of Management, Economics and Social Sciences University of Cologne Cologne Germany
3. Department of Psychiatry and Psychotherapy, University Hospital Cologne, Faculty of Medicine University of Cologne Cologne Germany
4. Institute for Medical Sociology, Health Services Research, and Rehabilitation Science (IMVR), Faculty of Medicine and University Hospital Cologne, Faculty of Human Sciences University of Cologne Cologne Germany
5. German Center for Neurodegenerative Diseases (DZNE) Bonn Germany