The Italian arm of the PREPARE study: an international project to evaluate and license a maternal vaccine against group B streptococcus oleh Alberto Berardi, Tiziana Cassetti, Roberta Creti, Caterina Vocale, Simone Ambretti, Mario Sarti, Fabio Facchinetti, Stephen Cose, the Prepare Network, Paul Heath, Kirsty Le Doare