1. Pediatric Institute of Southern Switzerland, Ospedale San Giovanni , Bellinzona , Switzerland
2. Università della Svizzera Italiana , Lugano , Switzerland
3. Pediatric Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico , Milan , Italy
4. Department of Clinical Sciences and Community Health , Università degli Studi di Milano , Milan , Italy
5. Pediatric Cardiology Unit, Department of Pediatrics , Centre Hospitalier Universitaire Vaudois (CHUV), and University of Lausanne , 1010 Lausanne , Switzerland
6. EOLAB, Department of Laboratory medicine, Ente Ospedaliero Cantonale , Bellinzona , Switzerland
7. Department of Internal Medicine, Ente Ospedaliero Cantonale , Locarno , Switzerland