Footnotes

• Contributors JHD developed the methodology, interpretation of the findings and critical revision of the manuscript. MH collected data, performed the analysis and revised the manuscript. PC contributed to data collection and critical review of the manuscript. OK contributed to data collection and critical review of the manuscript. RJM conceived the study, developed the methodology, data collection, performed analysis, drafted and revised the manuscript. All authors approved the final submitted 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 RJM received travel bursaries from Kyowa Kirin. JHD received travel bursaries from Novo Nordisk and honoraria from Kyowa Kirin.

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

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