González, Rodrigo, Juan Santacruz, Enrique Pérez Girala, and Carlos Mena Canata. “Anatomical Variations of the Frontal Sinus Drainage Pathway According to the IFAC Classification: Frequency and Interobserver Agreement in a Paraguayan Population”. European Journal of Health Research 12 (March 24, 2026): 1–17. Accessed April 2, 2026. https://revistas.uautonoma.cl/index.php/ejhr/article/view/3614.