1 Unit of Respiratory Diseases, Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy - laurabergantini@gmail.com.
2 Neonatal Intensive Care Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
3 Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.
4 Department of Molecular and Developmental Medicine, Le Scotte Polyclinic, University of Siena, Siena, Italy.
5 Unit of Respiratory Diseases, Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy.