1. EMGO Institute, VU University Medical Center, Amsterdam, the Netherlands.
2. Department of Nursing Home Medicine, VU University Medical Center, Amsterdam, the Netherlands.
3. Department of Public and Occupational Health, VU University Medical Center, Amsterdam, the Netherlands.
4. VU University Library, Medical Library, Amsterdam, the Netherlands.
5. End-of-Life Care Research Group, Vrije Universiteit Brussels, Brussels, Belgium.