Cost-effectiveness of expanding childhood routine immunization against Neisseria meningitidis serogroups C, W and Y with a quadrivalent conjugate vaccine in the African meningitis... oleh Andreas Kuznik, Garba Iliyasu, Mohammed Lamorde, Mustapha Mahmud, Baba M Musa, Ibrahim Nashabaru, Stephen Obaro, Idris Mohammed, Abdulrazaq G Habib