RT Journal Article SR Electronic T1 Tuberculosis, migration, and medical examination: lessons from history JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 282 OP 284 DO 10.1136/jech.2005.038604 VO 60 IS 4 A1 John Welshman A1 Alison Bashford YR 2006 UL http://jech.bmj.com/content/60/4/282.abstract AB