RT Journal Article SR Electronic T1 Dr Heyderman and her colleagues reply JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 1219 OP 1220 DO 10.1136/jcp.33.12.1219 VO 33 IS 12 A1 E Heyderman A1 A Bulman A1 AR Gibbons YR 1980 UL http://jcp.bmj.com/content/33/12/1219.abstract AB