1 Department of Health Services Research, Faculty of Health Medicine and Life Sciences, CAPHRI Care and Public Health Research Institute, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands.
2 Living Lab of Ageing and Long Term Care, Maastricht, The Netherlands.
3 Department of Public Health and Primary Care, Academic Centre for Nursing and Midwifery, KU Leuven, Leuven, Belgium.
4 Department of Public Health and Primary Care, Academic Centre for General Practice, KU Leuven, Leuven, Belgium.