Vitamin A supplementation in children in two cities in Maranhão. Research, Society and Development, [S. l.], v. 9, n. 9, p. e534997589, 2020. DOI: 10.33448/rsd-v9i9.7589. Disponível em: https://rsdjournal.org/rsd/article/view/7589. Acesso em: 5 dec. 2025.