Safitri, E. A. ., P. . Siagian, B. Y. M. . Sinaga, and P. C. . Eyanoer. “Vitamin C Supplementation Improves Pulmonary Tuberculosis Patients’ Sputum Conversion During Intensive Phase Category I Treatment in Medan”. Respiratory Science, vol. 2, no. 2, Feb. 2022, pp. 72-77, doi:10.36497/respirsci.v2i2.30.