RT Journal Article SR Electronic T1 Drs Ellis and Hitchock comment JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 891 OP 891 DO 10.1136/jcp.42.8.891-b VO 42 IS 8 YR 1989 UL http://jcp.bmj.com/content/42/8/891.2.abstract AB