RT Journal Article SR Electronic T1 Notification of tuberculosis: how many cases are never reported? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 411 OP 411 DO 10.1136/thx.48.4.411-b VO 48 IS 4 A1 J M Grange YR 1993 UL http://thorax.bmj.com/content/48/4/411.3.abstract AB