About the Authors

Frode Lindemark

frode.lindemark@igs.uib.no

Affiliations Department of Research and Development, Haukeland University Hospital, Bergen, Norway, Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway

Øystein A. Haaland

Affiliation Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway

Reidar Kvåle

Affiliations Norwegian Intensive Care Registry, Helse Bergen HF, Bergen, Norway, Department of Anesthesia and Intensive Care, Haukeland University Hospital, Bergen, Norway

Hans Flaatten

Affiliations Norwegian Intensive Care Registry, Helse Bergen HF, Bergen, Norway, Department of Anesthesia and Intensive Care, Haukeland University Hospital, Bergen, Norway, Department of Clinical Medicine, University of Bergen, Bergen, Norway

Kjell A. Johansson

Affiliations Department of Research and Development, Haukeland University Hospital, Bergen, Norway, Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: FL KAJ ØAH. Analyzed the data: FL ØAH RK HF KAJ. Wrote the paper: FL ØAH RK HF KAJ. Extracted the data set from the registry: RK HF. Guarantor for the statistical modelling: ØAH.