[1] Western Norway Univ Appl Sci, Dept Hlth & Caring Sci, Inndalsveien 28, N-5063 Bergen, Norway
[2] Haukeland Hosp, Dept Anesthesia & Intens Care, Postboks 1400, N-5021 Bergen, Norway
[3] Univ Bergen, Dept Clin Med, Postboks 7804, N-5020 Bergen, Norway
[4] Haukeland Hosp, Natl Burn Ctr, Dept Plast Hand & Reconstruct Surg, Postboks 1400, N-5021 Bergen, Norway
[5] Haukeland Hosp, Dept Res & Dev, Postboks 1400, N-5021 Bergen, Norway
[6] Univ Bergen, Dept Clin Sci, Postboks 7804, N-5020 Bergen, Norway
[7] Forde Comun Hosp, Dept Surg, Postboks 1000, N-6807 Forde, Norway
[8] Kings Coll London, Ctr Implementat Sci, Hlth Serv & Populat Res Dept, 16 De Crespigny Pk, London SE5 8AF, England