Reza Pahlavan Gharehbaba, Aghdas Barkhordari, and Hasan Shahbazi. 2017. “First Assessment the Analytical Quality Specification in Clinical Chemistry Laboratory, Using Sigma Scale and EQA/PT in Iran: A Pilot Study”. World Journal of Pharmaceutical Sciences 5 (8):165-70. https://wjpsonline.com/index.php/wjps/article/view/quality-clinical-chemistry-laboratory-sigma-scale.