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Contributors OJS developed the idea for the manuscript. JMPR and OJS drafted the first version of the manuscript. CL and CG added sections. All authors critically reviewed and revised the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests OJS, ES and CG: coauthors of Storebø et al. 2015 and 2018, which are mentioned in the application and in the review process.
Provenance and peer review Not commissioned; externally peer reviewed.