[1] St Olavs Univ Hosp, Dept Psychiat, N-7006 Trondheim, Norway
[2] Norwegian Univ Sci & Technol, Fac Med, Dept Publ Hlth & Gen Practice, N-7034 Trondheim, Norway
[3] St Olavs Univ Hosp, Dept Anaesthesia, Ctr Pain & Complex Disorders, N-7006 Trondheim, Norway
[4] Norwegian Univ Sci & Technol, Fac Med, Dept Circulat & Med Imaging, N-7034 Trondheim, Norway
[5] St Olavs Univ Hosp, Dept Phys Med & Rehabil, N-7006 Trondheim, Norway
[6] Oslo Univ Hosp, Dept Oncol, Oslo, Norway
[7] Norwegian Knowledge Ctr Hlth Serv, Oslo, Norway
[8] Norwegian Univ Sci & Technol, Dept Canc Res & Mol Med, Pain & Palliat Res Grp, N-7034 Trondheim, Norway
[9] Haukeland Hosp, Dept Oncol, N-5021 Bergen, Norway
[10] Cty Hosp, Dept Oncol, Jonkoping, Sweden
[11] Linkoping Univ, Dept Oncol, Linkoping, Sweden
[12] St Olavs Univ Hosp, Dept Oncol, Trondheim, Norway
[13] Norwegian Univ Sci & Technol, Fac Med, Dept Canc Res & Mol Med, N-7034 Trondheim, Norway
[14] Norwegian Univ Sci & Technol, Fac Med, Dept Neurosci, N-7034 Trondheim, Norway