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Contributors PLM wrote 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 PLM, via his institution, received industry-academic funding from AstraZeneca and has received speaker and consultancy fees from Boehringer Ingelheim and Hoffmann-La Roche, outside the submitted work.
Patient consent for publication Not required.
Provenance and peer review Commissioned; externally peer reviewed.
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