Immune response to 13-valent pneumococcal conjugate vaccine with a reduced dosing schedule. by Rodgers, G, Esposito, S, Principi, N, Gutierrez-Brito, M, Diez-Domingo, J, Pollard, A, Snape, MD, Martinón-Torres, F, Gruber, W, Patterson, S, Thompson, A, Gurtman, A, Paradiso, P, Scott, D