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  1. R Mark Beattie
  1. Southampton Children's Hospital, Southampton, UK
  1. Correspondence to Professor R Mark Beattie, Southampton Children's Hospital, Southampton, UK; Mark.beattie{at}

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  • 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 None declared.

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

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