SAHBAZ, I., TANER, M. T., KAGAN, G., SANISOGLU, H., ERBAS, E., DURMUS, E., TUNCA, M., & ENGINYURT, H. (2014). Deployment of Six Sigma Methodology in Phacoemulsification Cataract Surgery. International Review of Management and Marketing, 4(2), 123–131. Retrieved from https://www.econjournals.com/index.php/irmm/article/view/778