Pasaribu BT, Mujanah S, Fianto AYA. Analysis of Lean Six Sigma Modeling in Efforts to Improve Operational Performance at Royal Surabaya Hospital. IJEC [Internet]. 2025 Jun. 30 [cited 2025 Dec. 5];4(1):682-93. Available from: https://ejournal.ipinternasional.com/index.php/ijec/article/view/1376