Cramm, Jane, Xander Koolman, Valerie Møller, and Anna Nieboer. “Socioeconomic Status and Self-Reported Tuberculosis: A Multilevel Analysis in a Low-Income Township in the Eastern Cape, South Africa”. Journal of Public Health in Africa 2, no. 2 (September 5, 2011): e34. Accessed August 25, 2019. https://publichealthinafrica.org/index.php/jphia/article/view/jphia.2011.e34.