1 Department of Pediatrics, Division of Cardiology, Goryeb Children's Hospital, Atlantic Health System, Morristown, NJ, USA; Department of Pediatrics, Division of Cardiology, Columbia University Irving Medical Center, New York, NY, USA. Electronic address: [email protected].
2 Departments of Cardiology and Radiology, Royal Brompton Hospital, Guys and St Thomas' NHS Foundation Trust, London, UK; School of Biomedical Engineering and Imaging Sciences, King's College, London, UK.