Das, Palash, et al. “Initial Sputum Smear Grading Is a Predictor of Smear Conversion and Treatment Outcome in Pulmonary Tuberculosis: A Retrospective Cohort Study”. National Journal of Community Medicine, vol. 7, no. 10, Oct. 2016, pp. 792-6, https://njcmindia.com/index.php/file/article/view/1060.