RT Journal Article SR Electronic T1 Textbook of Endocrinology JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 246 OP 246 DO 10.1136/jcp.35.2.246-b VO 35 IS 2 A1 GW Pennington YR 1982 UL http://jcp.bmj.com/content/35/2/246.2.abstract AB