Ariga RA, Amelia R, Astuti SB, Fajar FAA, Ariga S, Ariga HPS, Pane NK. Implementation of Lean Six Sigma in Improving Competitive Advantage through Patient Satisfaction and Nurse Resources to Face the Covid-19 Pandemic at USU Medan Hospital. Open Access Maced J Med Sci [Internet]. 2022 Feb. 14 [cited 2024 May 4];10(G):218-22. Available from: https://oamjms.eu/index.php/mjms/article/view/7888