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Katherine L Brown, Jo Wray, Rachel L Knowles, Sonya Crowe, Jenifer Tregay, Deborah Ridout, David J Barron, David Cunningham, Roger Parslow, Rodney Franklin, Nick Barnes, Sally Hull & Catherine Bull.

Katherine L Brown ^1,*, Jo Wray ¹, Rachel L Knowles ², Sonya Crowe ³, Jenifer Tregay ¹, Deborah Ridout ², David J Barron ⁴, David Cunningham ⁵, Roger Parslow ⁶, Rodney Franklin ⁷, Nick Barnes ⁸, Sally Hull ⁹, Catherine Bull ¹

¹ Cardiac Unit, Great Ormond Street Hospital NHS Foundation Trust, London, UK
² Population Policy and Practice Programme, University College London Institute of Child Health, London, UK
³ Clinical Operational Research Unit, University College London, London, UK
⁴ Cardiac Surgery Department, Birmingham Children’s Hospital NHS Foundation Trust, Birmingham, UK
⁵ National Institute for Cardiovascular Outcomes Research, University College London, London, UK
⁶ Faculty of Medicine and Health, University of Leeds, Leeds, UK
⁷ Paediatric Cardiac Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
⁸ Department of Paediatrics, Northampton General Hospital NHS Trust, Northampton, UK
⁹ Primary Care Department, Queen Mary University of London, London, UK
^* Corresponding author Email: katherine.brown@gosh.nhs.uk