1. Unit of Infectious Diseases, Department of Medical and Surgical Sciences, S.Orsola Hospital, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.
2. Unit of Microbiology, Department of Medical and Surgical Sciences, S.Orsola Hospital, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.