[1] Norwegian Univ Sci & Technol NTNU, Dept Canc Res & Mol Med, European Palliat Care Res Ctr, N-7491 Trondheim, Norway
[2] Univ Trondheim Hosp, St Olavs Hosp, Canc Clin, Trondheim, Norway
[3] Univ Oslo, Inst Basic Med Sci, Dept Behav Sci Med, Oslo, Norway
[4] Oslo Univ Hosp, South Eastern Norway, Reg Ctr Excellence Palliat Care, Oslo, Norway
[5] Univ Aberdeen, Sch Med, Dept Publ Hlth, Aberdeen AB9 2ZD, Scotland