RT Journal Article SR Electronic T1 Year Book of Pathology and Clinical Pathology JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 644 OP 644 DO 10.1136/jcp.45.7.644-b VO 45 IS 7 A1 NA Shepherd YR 1992 UL http://jcp.bmj.com/content/45/7/644.2.abstract AB