Received: 10 December 2018
Accepted: 29 May 2019
First Online: 27 June 2019
Ethics approval and consent to participate
: Informed, signed consent for the use of anonymised CMR imaging data was obtained from all patients, or guardians of patients less than18 years age. The study protocol conforms to the ethical guidelines of the 1975 Declaration of Helsinki (National Research Ethics Service ethical code: 06/Q0508/124) (GOSH R&D no 07CC02).
: Not applicable.
: The authors declare that they have no competing interests.