The first of four interview rounds was completed in October 2021. These focus groups and individual interviews were conducted on site at the rehabilitation centers. Patient groups as well as employees, team leaders and medical directors were interviewed. Many thanks to all participants for these very personal insights into their working and private lives. Every single rehabilitation center had a very special way of welcoming me and my student assistants. Thank you very much for your warmth and excellent organization, everything went as planned. Thanks also go to the documentation assistants of the study. The student assistants are now very …