Zafiropoulos, George. “Six Sigma and Patient Satisfaction in Orthopaedic Clinic”. IJRDO - Journal of Social Science and Humanities Research 4, no. 2 (February 26, 2019): 89-97. Accessed December 11, 2024. http://545406.voltageenergyhk.tech/index.php/sshr/article/view/2708.