1. Infectious Diseases Unit; University Hospital of Trieste; Trieste Italy
2. Hygiene and Epidemiology; Department of Medical and Biological Sciences; University of Udine; Udine Italy
3. Strategic Plans and Activity Control Unit; University Hospital of Trieste; Trieste Italy
4. Laboratory for Microbiology; University Hospital of Trieste; Trieste Italy
5. Department of Medical Science; University Hospital of Trieste; Trieste Italy