1 Paediatric Cardiology Unit, Department of Pediatrics, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland; Heart Failure and Transplantation, Department of Paediatric Cardiology, Great Ormond Street Hospital, London, United Kingdom; Clinical Pharmacology and Therapeutics Group, University College London, London, United Kingdom; Division of Clinical Pharmacology and Toxicology, Institute of Pharmacological Sciences of Southern Switzerland, Ente Ospedaliero Cantonale, Lugano, Switzerland. Electronic address: webmaster@sebastianolava.ch.