Ratnatunga, Champa N, Vasanthi Thevanesam, Dushantha Madegedara, Neranjan LA Dissanayake, and K.G.R Athula Kumara. 2015. “T-SPOT. TB Assay and Tuberculin Skin Test for Diagnosis and Screening of Tuberculosis: First Report in a Sri Lankan Population”. Asian Journal of Medical Sciences 7 (1):14-19. https://www.nepjol.info/index.php/AJMS/article/view/12595.