1. Institute of General Practice, Goethe-University Frankfurt, Frankfurt am Main, Germany
2. Professional Association of Specialized Outpatient Palliative Care in Hesse, Wiesbaden, Germany
3. Department of General Practice and Family Medicine, Philipps-University of Marburg, Marburg, Germany
4. Department of Family medicine, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, The Netherlands