Ekinci, Celil Gokay, Mehmet Tolga Taner, and Engin Erbas. 2015. “Integration of Six Sigma Methodology to Reduce Complications in a Private Hemodialysis Center”. International Review of Management and Marketing 5 (1):36-44. https://econjournals.net.tr/index.php/irmm/article/view/1072.