1. Nursing Home Heijendaal; Arnhem the Netherlands
2. Section of Geriatrics; Department of Internal Medicine; Amsterdam Medical Centre; University of Amsterdam; Amsterdam the Netherlands
3. Department of Geriatrics; Radboud University Medical Centre; Nijmegen the Netherlands
4. Department of Primary and Community Care; Radboud University Medical Centre; Nijmegen the Netherlands
5. Joachim en Anna Centre for Specialised Geriatric Care; Nijmegen the Netherlands
6. Center for Evidence-Based Education; Amsterdam Medical Center; University of Amsterdam; Amsterdam the Netherlands