Footnotes

• SDM and A-SDC are joint first authors.

• Handling editor Josef S Smolen

• Twitter @PhilippeCarron

• PC and DE contributed equally.

• Contributors SDM—conception and design of research, acquisition of data analysis and interpretation of data, drafting the manuscript and revision of the manuscript for important intellectual content, final approval of the version to be published and shared first authorship. A-SDC—

  conception and design of research, acquisition of data analysis and interpretation of data, drafting the manuscript and revision of the manuscript for important intellectual content, final approval of the version to be published and shared first authorship. LD—conception and design of research, acquisition of data, drafting the manuscript and revision of the manuscript for important intellectual content and final approval of the version to be published. TR—conception and design of research, acquisition of data, drafting the manuscript and revision of the manuscript for important intellectual content and final approval of the version to be published. FEVdB—conception and design of research analysis and interpretation of data, drafting the manuscript and revision of the manuscript for important intellectual content and final approval of the version to be published. PC—conception and design of research analysis and interpretation of data, drafting the manuscript and revision of the manuscript for important intellectual content, final approval of the version to be published and equal contributorship with DE. DE—conception and design of research analysis and interpretation of data, drafting the manuscript and revision of the manuscript for important intellectual content, final approval of the version to be published and equal contributorship with PC.

• 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 None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.