1. Radboud University Nijmegen Medical Center; Centre For Quality of Care Research (WOK); PO Box 9101 114 Nijmegen Netherlands 6500 HB
2. VU University Medical Center; Department of General Practice; PO Box 7057 Amsterdam Netherlands 1007 MB
3. Radboud University Nijmegen Medical Center; Centre for Quality of Care Research (WOK); PO Box 9101 117 KWAZO Nijmegen Netherlands 6500 HB
4. Keele University; Department of Primary Care & Health Sciences; Keele Staffordshire UK ST5 5BG
5. Radboud University Nijmegen Medical Center; Scientific Institute for Quality of Health Care; PO Box 9101 114 IQ Health Care Nijmegen Netherlands 6500 HB
6. VU University; Department of Health Sciences, Faculty of Earth and Life Sciences; PO Box 7057 Room U454 Amsterdam Netherlands 1007 MB