RT Journal Article SR Electronic T1 Corrections JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 904 OP 904 DO 10.1136/jcp.35.8.904-b VO 35 IS 8 YR 1982 UL http://jcp.bmj.com/content/35/8/904.2.abstract AB