Anouk Spijker1,2
, Frans Verhey3
, Maud Graff1,2
, Richard Grol1
, Eddy Adang4
, Hub Wollersheim1
and Myrra Vernooij-Dassen1,2,5,6 
1Scientific Institute for Quality of Healthcare (IQ Healthcare), Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
2Alzheimer Centre Radboud University, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
3Department of Psychiatry/Alzheimer Centre Maastricht, University Hospital of Maastricht, Maastricht, The Netherlands
4Department of Epidemiology, Biostatistics and HTA, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
5Department of primary care and nursing home medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
6Kalorama Foundation, Beek-Ubbergen, The Netherlands