Pretreatment chest x-ray severity and its relation to bacterial burden in smear positive pulmonary tuberculosis by Murthy, SE, Chatterjee, F, Crook, A, Dawson, R, Mendel, C, Murphy, ME, Murray, SR, Nunn, AJ, Phillips, PPJ, Singh, KP, McHugh, TD, Gillespie, SH, REMoxTB Consortium