RT Journal Article SR Electronic T1 The authors comment JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 414 OP 415 DO 10.1136/jcp.33.4.414 VO 33 IS 4 A1 Birch, C A1 Hawker, A A1 Marshall, J A1 Gust, I YR 1980 UL http://jcp.bmj.com/content/33/4/414.abstract AB