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Footnotes
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Contributors DJH: Study design; data collection, analysis and interpretation; draft and revision of the article; approval of final version for submission. JF: Study conception; data collection, analysis and interpretation; critical revision of the article for intellectual content; approval of final version for submission. MW: Data analysis and interpretation; critical revision of the article for intellectual content; approval of final version for submission. RK (guarantor): Study conception; data analysis and interpretation; drafting and critical revision of the article for important intellectual content; approval of final version for submission.
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Competing interests None.
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Provenance and peer review Not commissioned; externally peer reviewed.