1 Department of Paediatrics, School of Medicine, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.
2 Department of Paediatric Pulmonology, Hospital das Clínicas, Federal University of Minas Gerais/Empresa Brasileira de Serviços Hospitalares (EBSERH), Belo Horizonte, MG, Brazil.
3 School of Medicine, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.