1. Unit of Biostatistics, Epidemiology and Public Health, Department of Cardiac, Thoracic, Vascular Sciences, and Public Health, University of Padova, Padova, Italy
2. Division of Laboratory Medicine, University Hospital Giuliano Isontina (ASU GI), Trieste, Italy
3. STI-AIDS Unit, University Hospital Giuliano Isontina (ASU GI), Trieste, Italy