1. Pulmonology Department, Centro Hospitalar Trás-os-Montes e Alto Douro, Vila Real,
2. Institute of Public Health, University of Porto, Porto,
3. Institute of Public Health, University of Porto, Porto, Gaia Pneumological Diagnostic Centre, Vila Nova de Gaia, Laboratory for Integrative and Translational Research in Population Health, Porto, ARS Norte Clinical Research Unit, Porto, Institute
of Biomedical Sciences Abel Salazar, University of Porto, Porto, Pulmonology Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal