[1] Vrije Univ Brussel, Dept Family Med & Chron Care, End Life Care Res Grp, Brussels, Belgium
[2] Univ Ghent, Brussels, Belgium
[3] Netherlands Inst Hlth Serv Res, NIVEL, Utrecht, Netherlands
[4] ISPO Canc Prevent & Res Inst, Florence, Italy
[5] Sci Inst Publ Hlth, Brussels, Belgium
[6] Minist Hlth Autonomous Community Castile & Leon, Publ Hlth Directorate, Valladolid, Spain
[7] Vrije Univ Amsterdam, Med Ctr, EMGO Inst Hlth & Care Res, Dept Publ & Occupat Hlth, Amsterdam, Netherlands