Department of Transmural Care (V.S., A.C., M.v.d.B.), University Hospital Maastricht, Maastricht; Institute for Research in Extramural Medicine (A.K.), VU University Medical Center, Amsterdam; Julius Center for General Practice and Patient-Oriented Research (B.v.d.L.), University Medical Center Utrecht, Utrecht; Center for Quality of Care Research (M.V.-D.), University Medical Center St. Radboud, Nijmegen; and Department of Medical Oncology (L.v.Z.), Erasmus MC-Daniel den Hoed Cancer Center, Rotterdam, The Netherlands