RT Journal Article SR Electronic T1 Errata JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 688 OP 688 DO 10.1136/jcp.28.8.688-c VO 28 IS 8 YR 1975 UL http://jcp.bmj.com/content/28/8/688.3.abstract AB