1 Pulmonology Department, Centro Hospitalar Vila Nova de Gaia e Espinho, Portugal. Electronic address: martasamarques93@hotmail.com.
2 Pulmonology Department, Centro Hospitalar Vila Nova de Gaia e Espinho, Portugal.
3 Pulmonology Department, Centro Hospitalar Vila Nova de Gaia e Espinho, Portugal; Pulmonary Function Laboratory, Centro Hospitalar Vila Nova de Gaia e Espinho, Portugal.
4 Pulmonology Department, Centro Hospitalar Vila Nova de Gaia e Espinho, Portugal; Pulmonary Function Laboratory, Centro Hospitalar Vila Nova de Gaia e Espinho, Portugal; Medicine Department, Faculty of Medicine of the University of Porto, Portugal.
5 Pulmonary Function Laboratory, Centro Hospitalar Vila Nova de Gaia e Espinho, Portugal.