1 Department of Health Services Research, Care and Public Health Research Institute, Maastricht University, Maastricht, the Netherlands; Department of Public Health and Primary Care, University of Leuven, Leuven, Belgium. Electronic address: michael.vanderelst@kuleuven.be.
2 Department of Public Health and Primary Care, University of Leuven, Leuven, Belgium.
3 Department of Health Services Research, Care and Public Health Research Institute, Maastricht University, Maastricht, the Netherlands; Department of Family Medicine, Care and Public Health Research Institute, Maastricht University, Maastricht, the Netherlands.
4 Department of Gerontology, Frailty in Ageing (FRIA) Research Group, Vrije Universiteit Brussel, Belgium; Research Center 360° Care and Well-being & Center for Applied Datascience (CADS), University College Ghent, Ghent, Belgium; Faculty of Psychology and Educational Sciences, Vrije Universiteit Brussel, Brussels, Belgium.