Information sheet for participants Information sheet for participants < 16yo Contact us at echoes@kcl.ac.uk A research project led by King's College London and the University of Maastricht. App and website designed by Cellule Studio 2020. Funded by the Wellcome Trust and by the European Union’s Horizon 2020 (g.a. 764738). Supported by the British Heart Foundation and Evelina Children's Heart Organisation.