1. Kumar V, Abbas AK, Fausto N, Mitchell RN: Robbins Basic Pathology. 2007, Philadelphia: Saunders Elsevier, 516-522. 8
2. World Health Organization: Global Tuberculosis Report. 2012, Geneva, Switzerland: WHO
3. World Health Organization: Retention in HIV Programmes, Defining the Challenges and Identifying Solutions. 2011, Geneva, Switzerland: WHO
4. Beyers N, Gie RP, Schaaf HS, Van Zyl S, Talent JM, Nel ED, Donald PR: A prospective evaluation of children under the age of 5 years living in the same household as adults with recently diagnosed pulmonary tuberculosis. Int J Tuberc Lung Dis. 1997, 1: 38-43.
5. Marais BJ, Gie RP, Schaaf HS, Hesseling AC, Obihara CC, Starke JJ, Enarson DA, Donald PR, Beyers N: The natural history of childhood intra-thoracic tuberculosis: a critical review of literature from the pre-chemotherapy era. Int J Tuberc Lung Dis. 2004, 8: 392-402.