1 Respiratory Diseases Unit, Department of Medical and Surgical Sciences & Neurosciences, University of Siena, Viale Bracci 1, Siena 53100, Italy. Electronic address: dalessandro.miriana@gmail.com.
2 Respiratory Diseases Unit, Department of Medical and Surgical Sciences & Neurosciences, University of Siena, Viale Bracci 1, Siena 53100, Italy. Electronic address: bargagli2@gmail.com.