RT Journal Article SR Electronic T1 Using faecal immunochemical test (FIT) undertaken in a national screening programme for large-scale gut microbiota analysis JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 429 OP 431 DO 10.1136/gutjnl-2020-321594 VO 70 IS 2 A1 Andrea C Masi A1 Sara Koo A1 Christopher A Lamb A1 Mark A Hull A1 Linda Sharp A1 Andrew Nelson A1 James S Hampton A1 Colin J Rees A1 Christopher J Stewart YR 2021 UL http://gut.bmj.com/content/70/2/429.abstract AB