1 Pediatric Cardiology Department, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal. Electronic address: andreia.francisco@gmail.com.
2 Cardiovascular MRI Department, Kings College, London, UK; Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St. Thomas NHS Foundation Trust, London, UK.
3 Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St. Thomas NHS Foundation Trust, London, UK.