[1] Vrije Univ Brussel, Dept Family Med & Chron Care, Brussels, Belgium
[2] Vrije Univ Brussel, End Of Life Care Res Grp, Brussels, Belgium
[3] Univ Ghent, Ghent, Belgium
[4] Univ Ghent, Dept Family Med & Primary Hlth Care, Ghent, Belgium
[5] Univ Utrecht, Dept Educ, Utrecht, Netherlands