1. Development of a Crohn's disease activity index;Best, W.R.; Becktel, J.M.; Singleton, J.W.; Kern, Jr, F.;National Cooperative Crohn's Disease Study. Gastroenterology,1976
2. A simple index of Crohn's disease activity;Harvey, R.F.; Bradshaw, J.M.;Lancet,1980
3. An index of inflammatory activity in patients with Crohn's disease;van Hees PAM; van Elteren Ph; van Lier HJJ; van Tongeren JHM,1980
4. National Cooperative Crohn's disease study: results of drug treatment;Summers, R.W.; Switz, D.M.; Sessions, J.T.;Gastroenterology,1979
5. European Cooperative Crohn's disease study (ECCDS): Results of drug treatment;Malchow, H.; Ewe, K.; Brandes, J.W.;Gastroenterology,1984