Analysis of maternal mortality in Piauí before and during the Covid-19 pandemic in the years 2019 to 2020. Research, Society and Development, [S. l.], v. 11, n. 17, p. e02111737268, 2022. DOI: 10.33448/rsd-v11i17.37268. Disponível em: https://ojs34.rsdjournal.org/index.php/rsd/article/view/37268. Acesso em: 28 jun. 2025.