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Sulma Hajijatur Ridlwana, Arifiani Agustin Amalia and Yeni Rahmawati 2025. Internal Quality Control Analysis of Sgot and Sgpt Examination Using Levey-Jennings Graphics and Six Sigma at X Hospital Yogyakarta: Analisis Quality Control Internal Pemeriksaan Sgot dan Sgpt Menggunakan Grafik Levey-Jennings dan Six Sigma di RS X Yogyakarta. Journal of Health (JoH). 12, 1 (Jan. 2025), 060-068. DOI:https://doi.org/10.30590/joh.v12n1.1002.