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Contributors Both authors had substantial contributions to the conception or design of the work; drafting the work and revising it critically for important intellectual content; final approval of the version published. Both authors agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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 DJAJ reports personal fees from Boehringer Ingelheim, personal fees from Novartis, and personal fees from AstraZeneca, outside the submitted work. MJJ is clinical consultant for Mayne Pharma for which the University of Hull received payment.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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