^○Agnieszka Grzyb^1,3, Adam Kolesnik^2,3, Joanna Duliban³, Monika Kowalczyk-Domagala¹, Maria Zubrzycka², Grazyna Brzezinska-Rajszys^1,2, Renata Bokiniec⁴, Joanna Dangel³ (1.Cardiology Department, The Children's Memorial Health Institute, Warsaw, Poland, 2.Heart Catheterization Laboratory, The Children's Memorial Health Institute, Warsaw, Poland, 3.Perinatal Cardiology and Congenital Anomalies Department, Centre of Postgraduate Medical Education, Warsaw, Poland, 4.Neonatology and Neonatal Intensive Care Department, Medical University of Warsaw, Warsaw, Poland)

^○Gabrielle Norrish^1,2, Christina Ding³, Ella Field^1,2, Paediatric Hypertrophic Cardiomyopathy Investigators*,⁴, Rumana Omar³, Juan Pablo Kaski^1,2 (1.Great Ormond Street Hospital, London UK, 2.Institute of Cardiovascular Sciences University College London, UK, 3.Department of Statistical Science, University College London, London UK)

^○O Villemain¹, N. Ben Moussa², S Malekzadeh-Milani¹, M. Meot1, Ma Mostefa-Kara¹, D. Bonnet¹, Y Boudjemline¹ (1.M3C-Necker Enfants malades, AP-HP, Université Paris Descartes, Sorbonne Paris Cité, Paris, France, 2.Cardiology Department, Hopital Européen Georges Pompidou, Paris, France)