Doerfler, M. D., K. N. Truitt, M. J. Fisher, G. Theron, and S. M. McFall. “A Novel Collection Cup for Tuberculosis Sputum in South Africa: Engineering Design and User Testing Considerations”. Global Health Innovation, vol. 1, no. 2, Nov. 2018, doi:10.15641/ghi.v1i2.642.