Sabino, E. C., Guerra, E. M., Oba, I. T., Spina, A. M. M., & Vaz, A. J. (1992). Frequency of hepatitis B serological markers in first consultation pregnant women at health centers in a metropolitan area, S. Paulo city, Brazil . Revista Do Instituto De Medicina Tropical De São Paulo, 34(6), 535-541. https://revistas.usp.br/rimtsp/article/view/28978