Edited byHorst Sievert, MD, director, CardioVascular Center CVC and St. Katharinen Hospital, Frankfurt, GermanyShakeel A. Qureshi, MD, FRCP, paediatric cardiologist, Guy’s and St Thomas’ NHS Foundation Trust, London, UKNeil Wilson, MD, professor of pediatrics and director, Cardiac Catheterization Laboratory, Heart Institute, Children’s Hospital Colorado, Aurora, USAZiyad M. Hijazi, MD, MPH, MSCAI, FACC, acting chief medical officer and clinical service chief, Department of Pediatrics, Sidra Medical and Research Center, Doha, Qatar