History of the construction of knowledge about Down Syndrome in the 19th and early 20th centuries. Research, Society and Development, [S. l.], v. 9, n. 6, p. e165963574, 2020. DOI: 10.33448/rsd-v9i6.3574. Disponível em: https://www.rsdjournal.org/rsd/article/view/3574. Acesso em: 5 dec. 2025.