PT - JOURNAL ARTICLE AU - Mansfield, J C TI - Which 5-ASA? AID - 10.1136/gut.52.5.771 DP - 2003 May 01 TA - Gut PG - 771--771 VI - 52 IP - 5 4099 - http://gut.bmj.com/content/52/5/771.short 4100 - http://gut.bmj.com/content/52/5/771.full SO - Gut2003 May 01; 52