Contreras-Levicoy, Juan, Erika Astorga, Rodrigo Castro, Galdys Yentzen, and Miguel Cumsille. “Spontaneous in the Llay-Llay Hospital and Their Relation to mothers’s Agricultural Labors”. Revista Chilena de Salud Pública 9, no. 1 (January 1, 2005): p. 7–11. Accessed April 28, 2025. https://revistaderechopublico.uchile.cl/index.php/RCSP/article/view/19954.