1. Department of Health Services Research; Faculty of Medicine and Health Sciences; Carl von Ossietzky University Oldenburg; Oldenburg Germany
2. Institute of Medical Sociology, Health Services Research, and Rehabilitation Science (IMVR); Faculty of Human Sciences and Faculty of Medicine; University of Cologne; Cologne Germany
3. Department of Urology; University Hospital Cologne; Cologne Germany
4. Center for Health Communication and Health Services Research; Department of Psychosomatic Medicine and Psychotherapy; University Hospital Bonn; Bonn Germany
5. Health Research for Men GmbH; Berlin Germany