1 CNR Institute for Biomedical Research and Innovation (IRIB), Via U. La Malfa, 153 - 90146 Palermo, Italy; CNR Institute of Clinical Physiology (IFC), Via Trieste 41 - 56126 Pisa, Italy. Electronic address: viegig@ifc.cnr.it.
2 NuESA-Health and Environment Study Unit, Faculty of Health Sciences, University of Beira Interior, Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal; UBIAir-Clinical & Experimental Lung Centre, UBIMedical, University of Beira Interior, EM506, 6200-000 Covilhã, Portugal; CICS-Health Sciences Research Centre, University of Beira Interior, Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal. Electronic address: tabordabarata@fcsaude.ubi.pt.