Lyra, L. G., Damasceno, A. P., Cotrim, P., Mota, E., & Silva, L. (1986). Prevalence of antibody to hepatitis B virus in an urban population of northeast Brazil . Revista Do Instituto De Medicina Tropical De São Paulo, 28(6), 406-409. https://revistas.usp.br/rimtsp/article/view/101210