1 Paediatric Respiratory Unit, Department of Paediatrics, Hospital de Santa Maria, CHULN, Lisbon, Portugal; Paediatric Lung Function Laboratory, Department of Paediatrics, Hospital de Santa Maria, CHULN, Lisbon, Portugal; Lisbon Academic Medical Centre, University of Lisbon, Lisbon, Portugal.
2 Paediatric Respiratory Unit, Department of Paediatrics, Hospital de Santa Maria, CHULN, Lisbon, Portugal; Lisbon Academic Medical Centre, University of Lisbon, Lisbon, Portugal.
3 Paediatric Respiratory Unit, Department of Paediatrics, Hospital de Santa Maria, CHULN, Lisbon, Portugal.
4 Paediatric Lung Function Laboratory, Department of Paediatrics, Hospital de Santa Maria, CHULN, Lisbon, Portugal.
5 General Radiology Service, Hospital de Santa Maria, CHULN, Lisbon, Portugal.