Omeñaca, F. Merino, J.M. Tejedor, J.-C. Constantopoulos, A. Papaevangelou, V. Kafetzis, D. Tsirka, A. Athanassiadou, F. Anagnostakou, M. François, N. Borys, D. Schuerman, L., Immunization of preterm infants with 10-valent pneumococcal conjugate vaccine, PEDIATRIC INVESTIGATION, (128), e290-e298, 2011,