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Contributors RS: acquisition and interpretation of data; drafting the letter; final approval of letter; agreement 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. IS: substantial contributions to the conception of the work; drafting the letter; final approval of letter; agreement 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. JL: interpretation of data; revising intellectual content; final approval of letter; agreement 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. JP: interpretation of data; critical analysis of content; final approval of letter; agreement 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.
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Competing interests None.
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Provenance and peer review Not commissioned; internally peer reviewed.
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