Ariga, Reni Asmara, Rina Amelia, Sri Budi Astuti, Fajar Amanah Ariga Fajar, Selviani Ariga, Hijrah Purnama Sari Ariga, and Nikmah Kemalasari Pane. 2022. “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 Macedonian Journal of Medical Sciences 10 (G):218-22. https://doi.org/10.3889/oamjms.2022.7888.