1. Pulmonology Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
2. CINTESIS@RISE, MEDCIDS, Faculty of Medicine of the University of Porto, Porto, Portugal
3. ISPUP-EPI Unit, Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Portugal
4. Faculty of Health/School of Medicine, Department of Pneumology, Cologne Merheim Hospital, Kliniken der Stadt Köln gGmbH, Witten/Herdecke University, Cologne, Germany
5. Faculty of Medicine, University of Porto, Porto, Portugal