1. Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy.
2. Clinical Pathology and Microbiology Unit, San Giovanni di Dio Hospital, Crotone, Italy.
3. Microbiology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.
4. Clinical Microbiology and Virology Unit, A. Manzoni Hospital, Lecco, Italy.
5. Clinical Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy.