1. Paediatric Cardiology Service, Paediatric Hospital, Coimbra Hospital and Universitary Centre, Coimbra, Portugal
2. CMUC, Department of Mathematics, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
3. Coimbra Institute for Clinical and Biomedical Researh (iCBR) - Faculty of Medicine - University of Coimbra, Coimbra, Portugal