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