About the Authors

Pernille Frederiksen

Contributed equally to this work with: Pernille Frederiksen, Tom Bendix

frederiksarbejde@outlook.dk

Affiliations Copenhagen Center for Back Research (COPE BACK), Centre for Rheumatology and Spine Diseases, Glostrup, Denmark, Metropolitan University College, Copenhagen, Denmark, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

Aage Indahl

‡ These authors also contributed equally to this work

Affiliations Uni Health, University of Bergen, Bergen, Norway, Department of Research and Development, Clinic Physical Medicine and Rehabilitation, Vestfold Hospital Trust, Stavern, Norway

Lars L. Andersen

‡ These authors also contributed equally to this work

Affiliations National Research Centre for the Working Environment, Copenhagen, Denmark, Physical Activity and Human Performance group, Center for Sensory-Motor Interaction, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark

Kim Burton

‡ These authors also contributed equally to this work

Affiliation Centre for Applied Psychological and Health Research, University of Huddersfield, Huddersfield, United Kingdom

Rasmus Hertzum-Larsen

Affiliation Danish Cancer Society Research and Data, Copenhagen, Denmark

Tom Bendix

Contributed equally to this work with: Pernille Frederiksen, Tom Bendix

Affiliations Copenhagen Center for Back Research (COPE BACK), Centre for Rheumatology and Spine Diseases, Glostrup, Denmark, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: PF TB KB AI LLA. Data curation: PF LLA RHL. Formal analysis: PF LLA RHL. Funding acquisition: PF TB. Investigation: PF TB. Methodology: PF TB AI LLA. Project administration: PF TB. Resources: PF LLA TB. Software: PF LLA RHL. Supervision: PF TB AI LLA KB. Validation: PF TB LLA. Visualization: PF TB LLA. Writing – original draft: PF TB LLA KB. Writing – review & editing: PF TB AI LLA RHL KB.