title: Dual bronchodilation and exacerbations of COPD.
authors.affiliation: Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy.
authors.forename: Mario
authors.initials: M
authors.lastname: Cazzola
authors.affiliation: Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy.
authors.forename: Josuel
authors.initials: J
authors.lastname: Ora
authors.affiliation: Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy.
authors.forename: Ermanno
authors.initials: E
authors.lastname: Puxeddu