Evaluation of HIV Transmission Clusters among Natives and Foreigners Living in Italy oleh Lavinia Fabeni, Maria Mercedes Santoro, Patrizia Lorenzini, Stefano Rusconi, Nicola Gianotti, Andrea Costantini, Loredana Sarmati, Andrea Antinori, Francesca Ceccherini-Silberstein, Antonella d’Arminio Monforte, Annalisa Saracino, Enrico Girardi, on behalf of the Icona Foundation Study Cohort