RT Journal Article SR Electronic T1 THE ROUTINE ASSAY OF B12 IN SERUM JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 224 OP 226 DO 10.1136/jcp.11.3.224 VO 11 IS 3 A1 Tiffin, A. I. A1 Williamson, G. M. YR 1958 UL http://jcp.bmj.com/content/11/3/224.abstract AB