[1] Univ Ghent, End Of Life Care Res Grp, Brussels, Belgium
[2] Vrije Univ Brussel, Dept Family Med, B-1090 Brussels, Belgium
[3] Vrije Univ Amsterdam, Med Ctr, EMGO Inst Hlth & Care Res, Dept Gen Practice & Elder Care Med, Amsterdam, Netherlands
[4] Vrije Univ Amsterdam, Med Ctr, EMGO Inst Hlth & Care Res, Dept Publ & Occupat Hlth, Amsterdam, Netherlands
[5] Univ Ghent, Heymans Inst Pharmacol, B-9000 Ghent, Belgium