[1] Haukeland Hosp, Inst Med, N-5021 Bergen, Norway
[2] Haukeland Hosp, Inst Surg Sci, N-5021 Bergen, Norway
[3] Haukeland Hosp, Dept Anaesthesia & Intens Care, N-5021 Bergen, Norway
[4] Univ Bergen, Inst Med, Bergen, Norway
[5] Haukeland Hosp, Dept Med, N-5021 Bergen, Norway
[6] Haukeland Hosp, Dept Cardiol, N-5021 Bergen, Norway