[1] Netherlands Inst Hlth Serv Res Nivel, POB 1568, NL-3513 CR Utrecht, Netherlands
[2] Maasveld, Koraal, Maastricht, Netherlands
[3] Maastricht Univ, Med Ctr, Expertise Ctr Palliat Care, Maastricht, Netherlands
[4] Maastricht Univ, Dept Family Med, Fac Hlth Med & Life Sci, Maastricht, Netherlands
[5] Vrije Univ Amsterdam, Dept Publ & Occupat Hlth, Amsterdam UMC, Amsterdam, Netherlands
[6] Expertise Ctr Palliat Care, Amsterdam, Netherlands