RT Journal Article SR Electronic T1 Proceedings: Endoscopic biopsy and the diagnosis of duodenitis. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 930 DO 10.1136/jcp.27.11.930-c VO 27 IS 11 A1 Betteridge, T J YR 1974 UL http://jcp.bmj.com/content/27/11/930.3.abstract AB