De Queirós, L., Castro, L., Ferreira, M.C. and Gonçalves, G. 2004. Acceptance of the new conjugate vaccines. Meningococcal and pneumococcal vaccines, in the cohort born in 1999, in the North Region of Portugal. Acta Médica Portuguesa. 17, 1 (Feb. 2004), 49–53. DOI:https://doi.org/10.20344/amp.1754.