1. Department of Advanced Translational Microbiology, Institute for Maternal and Child Health IRCCS Burlo Garofolo, 34137 Trieste, Italy
2. Clinical Epidemiology and Public Health Research Unit, Institute for Maternal and Child Health IRCCS Burlo Garofolo, 34137 Trieste, Italy
3. Department of Obstetrics and Gynecology, IRCCS San Raffaele Scientific Institute, University Vita and Salute San Raffaele, 20132 Milano, Italy
4. MST Centre, ASUGI Maggiore Hospital, 34134 Trieste, Italy
5. National AIDS Unit, Department of Infectious Diseases, Istituto Superiore di Sanità, 00161 Rome, Italy
6. Department of Medicine, Surgery and Health Sciences, University of Trieste, 34149 Trieste, Italy