1. Microbiology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
2. Department of Medical and Surgical Sciences, Section of Microbiology, University of Bologna, 40138 Bologna, Italy
3. Infectious Diseases Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
4. Department of Medical and Surgical Sciences, Infectious Diseases Section, Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy