[1] Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Canc Clin, European Palliat Care Res Ctr PRC, Trondheim, Norway
[2] Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Clin & Mol Med, Trondheim, Norway
[3] Trondheim Reg & Univ Hosp, St Olavs Hosp, Trondheim, Norway
[4] Trondheim Reg & Univ Hosp, St Olavs Hosp, Dept Med, Trondheim, Norway
[5] Univ Oslo, Inst Clin Med, European Palliat Care Res Ctr, Oslo, Norway
[6] Univ Oslo, Dept Oncol, Oslo, Norway
[7] Oslo Univ Hosp, Oslo, Norway
[8] Coordinat Unit Orkdal Reg, Orkanger, Orkdal Region, Norway
[9] Univ Oslo, Fac Med, Inst Basic Med Sci, Oslo, Norway
[10] Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Publ Hlth & Nursing, Trondheim, Norway