Institution: | aDepartment of Obstetrics and Gynecology, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy;bDepartment of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy;cDepartment of Microbiology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy |