Silent threat: the presence of heavy metals from anthropogenic and natural sources. Implications for public health:: A narrative review. Actas Médicas (Ecuador), [S. l.], v. 34, n. 1, p. 87–103, 2024. DOI: 10.61284/181. Disponível em: https://actasmedicas.ec/index.php/am/article/view/181.. Acesso em: 27 oct. 2025.