1. World Health Organization: TB as a public health problem. Department of communicable disease. (2 screens). Accessed. January 21/2004, [http://www.whosea.org/tb/publichealth.htm]
2. Ward HA, Marciniuk DD, Pahwa P, Hoeppner VH: Extent of pulmonary tuberculosis in patients diagnosed by active compared to passive case finding. Int J Tuberc Lung Dis. 2004, 8 (5): 593-597.
3. Lawn SD, Afful B, Acheampong JW: Pulmonary tuberculosis: Diagnostic delay in Ghanaian adults. Int J Tuberc Lung Dis. 1998, 2 (8): 635-640.
4. Pirkis JE, Speed BR, Yung AP, Dunt DR, Mac Intyre CR, Plant AJ: Time to initiation of anti-tuberculosis treatment. INT J Tuberc Lung Dis. 1996, 77 (5): 401-406. 10.1016/S0962-8479(96)90111-2.
5. Steen TW, Mazonde GN: Pulmonary tuberculosis in Kweneng district, Botswana: delays in diagnosis in 212 smear-positive patients. Int J Tuberc Lung Dis. 1998, 2 (8): 627-634.