[1] Umea Univ, Dept Radiat Sci Oncol, Umea, Sweden
[2] Reg Canc Ctr Stockholm Gotland, Stockholm, Sweden
[3] Umea Univ, Dept Nursing, Umea, Sweden
[4] Karolinska Inst, Dept Neurobiol Caring Sci & Soc, Stockholm, Sweden
[5] Karolinska Inst, Dept Physiol & Pharmacol, Stockholm, Sweden
[6] Dept Radiat Sci Oncol, S-90187 Umea, Sweden