RT Journal Article SR Electronic T1 Is the time taken for sputum cultures to become negative in multidrug-resistant TB related to treatment outcome? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 670 OP 670 DO 10.1136/thx.2006.la0213 VO 61 IS 8 A1 F Morell-Ducos YR 2006 UL http://thorax.bmj.com/content/61/8/670.abstract AB