The First Assessments of Pediatric HBV Immunization Coverage in Mauritania and Persistence of Antibody Titers Post Infant Immunizations oleh Hala El Hachimi, Mohamed Mahmoud Mohamed El Alem, Esma Haimoudane, Cheikh Yebouk, Jannie Pedersen, F-Zahra Fall-Malick, Fatimetou Khiddi, Mohamed Abdawe, Sidi Ahmed Sadegh, Hugues Fausther-Bovendo, Mohamed Vall Mohamed Abdellahi