1. Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands.
2. Department of Health Sciences, Section of Nursing Science, University Medical Center Groningen, Groningen, The Netherlands.
3. QualityZorg, Nieuw-Vennep, The Netherlands.
4. Bosman, Eindhoven, The Netherlands.
5. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands.