1 Department of Pediatrics, Hospital de São Francisco Xavier - Centro Hospitalar de Lisboa Ocidental, Estr. Forte do Alto Duque, 1449-005, Lisbon, Portugal. mariaserodio@campus.ul.pt.
2 Department of Pediatrics, Hospital de São Francisco Xavier - Centro Hospitalar de Lisboa Ocidental, Estr. Forte do Alto Duque, 1449-005, Lisbon, Portugal.