About the Authors

Karin A. A. De Ridder

karin.de.ridder@ntnu.no

Affiliations Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway, Department of Physical Medicine and Rehabilitation, Levanger Hospital, Nord-Trøndelag Health Trust, Levanger, Norway

Kristine Pape

Affiliation Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway

Roar Johnsen

Affiliation Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway

Turid Lingaas Holmen

Affiliation HUNT Research Center, Department of Public Health and General Practice, Norwegian University of Science and Technology, Levanger, Norway

Steinar Westin

Affiliation Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway

Johan Håkon Bjørngaard

Affiliations Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway, Forensic Department and Research Centre Bröset, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KDR KP RJ TLH JHB. Analyzed the data: KDR KP JHB. Wrote the paper: KDR KP RJ TLH SW JHB. Responsible for the Young-HUNT data collection: TLH.