PT - JOURNAL ARTICLE AU - Bjarnason, Ingvar AU - Gumpel, Michael TI - Reply AID - 10.1136/gut.32.3.338-c DP - 1991 Mar 01 TA - Gut PG - 338--339 VI - 32 IP - 3 4099 - http://gut.bmj.com/content/32/3/338.4.short 4100 - http://gut.bmj.com/content/32/3/338.4.full SO - Gut1991 Mar 01; 32