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Comparison between Keros and Gera Classifications on Paranasal Sinuses Computed Tomography Scan in One Teaching Hospital in Medan, Indonesia. Althea Med J [Internet]. 2025 Mar. 30 [cited 2026 Jul. 14];12(1):51-7. Available from: https://journal.fk.unpad.ac.id/index.php/amj/article/view/3659