1. Anesthesia and Intensive Care Medicine, Policlinico di Modena, University of Modena and Reggio Emilia, 41124 Modena, Italy
2. Microbiology and Virology Unit, Azienda Ospedaliero-Universitaria Policlinico, 41124 Modena, Italy
3. Infectious Diseases Unit, Policlinico di Modena, University of Modena and Reggio Emilia, 41124 Modena, Italy
4. Respiratory Diseases Unit, Policlinico di Modena, University of Modena and Reggio Emilia, 41124 Modena, Italy