[1] Orebro Univ, Fac Med & Hlth, Sch Hlth Sci, Orebro, Sweden
[2] Falu Lasarett, Intens Care Unit, Dept Anesthesia, Falun, Sweden
[3] Ctr Clin Res, Falun, Dalarna, Sweden
[4] Danderyd Hosp, Dept Orthoped, Stockholm, Sweden
[5] Danderyd Hosp, Karolinska Inst, Dept Clin Sci, Stockholm, Sweden
[6] Dalarna Univ, Sch Educ Hlth & Social Studies, Falun, Sweden