Yulius, Sadri, Harry Agustaf Asroel, Askaroellah Aboet, and Fotarisman Zaluchu. 2018. “Correlation of Matrix Metalloproteinase-9 (MMP-9) Expression and Bone Destruction in Chronic Suppurative Otitis Media (CSOM) Patients With Cholesteatoma at Adam Malik General Hospital Medan-Indonesia”. Bali Medical Journal 7 (1):195-200. https://doi.org/10.15562/bmj.v7i1.751.