Social determinants of health in obstetric emergencies: bibliometric-systematic review PRISMA based (2015-2025). SciELO Preprints, 2026. DOI: 10.1590/SciELOPreprints.18417. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/18417. Acesso em: 3 nov. 2026.