Randomized trial to assess the immunogenicity, safety and antibody persistence up to three years after a single dose of a tetravalent meningococcal serogroups A, C, W-135 and Y tetanus toxoid conjugate vaccine in toddlersT. Vesikari, A. Forsten, D. Boutriau, V. Bianco, M. van der Wielen, J.M. MillerTijdschriftartikel