Steingart, K.R., Henry, M., Hopewell, P.C., Ramsay, A., Cunningham, J., Urbanazik, R., Perkins, M.D., Aziz, M.A. and Pai, M. (2006) Fluorescence versus conventional sputum smear microscopy for tuberculosis: A systematic review. The Lancet Infectious Diseases, 6, 570-581.