1. Laboratory of Microbiology, Department of Preclinical Science LITA Vialba, University of Milan, Milan, Italy
2. Institute of Pediatrics, University of Milan, Fondazione IRCCS Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Milan, Italy
3. Institute of Respiratory Diseases, University of Milan, Fondazione IRCCS Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Milan, Italy
4. Department of Otolaryngology, University of Milan, Fondazione IRCCS Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Milan, Italy