González, R., Santacruz, J. ., Pérez Girala, E. ., & Mena Canata, C. . (2026). 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, 1–17. https://doi.org/10.32457/ejhr.v12.3614