Barros, F. C., Victora, C. G., Granzoto, J. A., Vaughan, J. P., & Lemos Júnior, A. V. (1984). Perinatal health in Pelotas, Rio Grande do Sul, Brazil: social and biological factors . Revista De Saúde Pública, 18(4), 301-312. https://doi.org/10.1590/S0034-89101984000400005