Analisis Quality Control Internal Pemeriksaan Sgot dan Sgpt Menggunakan Grafik Levey-Jennings dan Six Sigma di RS X Yogyakarta: Internal Quality Control Analysis of Sgot and Sgpt Examination Using Levey-Jennings Graphics and Six Sigma at X Hospital Yogyakarta. JoH [Internet]. 2025 Aug. 14 [cited 2026 May 4];12(1):060-8. Available from: https://journal.gunabangsa.ac.id/joh/article/view/92