RT Journal Article SR Electronic T1 Limitations of faecal chymotrypsin as a screening test. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1570 OP 1570 DO 10.1136/gut.32.12.1570 VO 32 IS 12 A1 Cavallini, G A1 Benini, L YR 1991 UL http://gut.bmj.com/content/32/12/1570.1.abstract AB