[1] Radboud Univ Nijmegen, Med Ctr, Dept Anaesthesiol Pain & Palliat Care, POB 9101,Internal Code 549, NL-6500 HB Nijmegen, Netherlands
[2] Erasmus Univ, Dept Hlth Serv & Management Org, Rotterdam, Netherlands
[3] Univ Lancaster, Div Hlth Res, Int Observ End Life Care, Lancaster, England
[4] Univ Klinikum Bonn, Klin Palliat Med, Bonn, Germany
[5] Univ Hosp Leuven, Dept Radiat Oncol & Palliat Care, Leuven, Belgium
[6] Univ Pecs, Sch Med, Dept Primary Hlth Care, Pecs, Hungary