Sengupta S, Chung DW, Kumar R, Gupta P, Upadhyay S, Rattan A. Sigma metrics as quality indicators in guiding and tracking laboratory process improvement. Int J Res Med Sci [Internet]. 2023 Dec. 12 [cited 2025 Oct. 13];12(1):75-81. Available from: https://www.msjonline.org/index.php/ijrms/article/view/13028