1. Section of Microbiology, Department of Clinical and Experimental Medicine
2. Section of Anatomic Pathology, Department of Oncology, Bellaria Hospital, University of Bologna, Bologna, Italy
3. Department of Preventive Pediatrics and Neonatology, St Orsola Malpighi General Hospital, University of Bologna, Bologna, Italy
4. Department of Obstetrics and Gynecology, St Orsola Malpighi General Hospital, University of Bologna, Bologna, Italy