1. Department of Radiation Oncology, University of Freiburg – Medical Center, Freiburg, Germany
2. German Cancer Consortium (DKTK) Partner Site Freiburg, German Cancer Research Centre (DKFZ), Heidelberg, Germany
3. Department of Health Care Management, Albert-Ludwigs University of Freiburg, Freiburg, Germany
4. Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
5. Department of Business Administration VI, Public and Non-Profit Management - Corporate Governance and Ethics, University of Freiburg, Freiburg, Germany