1. Department of Oncology, University Center for Palliative Care, Inselspital, University Hospital, Bern, Switzerland
2. Department of Health Services Research, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, the Netherlands
3. Special Care Consultants, Duncansville, PA, USA
4. Institute of Nursing Science, Medical University Graz, Graz, Austria
5. Department of Family Medicine; Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, the Netherlands