RT Journal Article SR Electronic T1 Correction JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 92 OP 92 DO 10.1136/jcp.45.1.92-c VO 45 IS 1 YR 1992 UL http://jcp.bmj.com/content/45/1/92.3.abstract AB