Gonçalves, G, F Tavares, and H R de Andrade. 1998. “A Seroconversion Study of the Measles Component of the MMR Vaccine in Adolescents of the Town of Sabrosa”. Acta Médica Portuguesa 11 (12). Lisbon, Portugal:1079-84. https://doi.org/10.20344/amp.2363.