%0 Journal Article %A D Schuppan %A T Freitag %T Fistulising Crohn’s disease: MMPs gone awry %D 2004 %R 10.1136/gut.2003.034207 %J Gut %P 622-624 %V 53 %N 5 %U https://gut.bmj.com/content/gutjnl/53/5/622.full.pdf