Costa, Isabel de Camargo, et al. “ Evaluation of Humoral Response to Heptavalent Pneumococcal Conjugate Vaccine in HIV-Infected Children ”. Revista De Saúde Pública, vol. 42, no. 5, Oct. 2008, pp. 844-50, https://doi.org/10.1590/S0034-89102008005000048.