1. How effective are current drugs for Crohn's disease. A metaanalysis;Salomon, P.; Kornbluth, A.; Aisenberg, J.; Janowitz, H.D.;J Clin Gastroenterol,1992
2. Development of a Crohn's Disease Activity Index;Best, W.R.; Bectel, J.M.; Singleton, J.W.; Kern, F.;Gastroenterology,1976
3. Smoking in South Africa: the health and economic impact;Yach, D.; McIntyre, D.; Saloojee, Y.;Tobacco Control,1992
4. Controlled trial of azathioprine in Crohn's disease;Willoughby, J.M.T.; Kumar, P.J.; Beckett, J.; Dawson, A.M.;Lancet,1971
5. Controlled trial of azathioprine in Crohn's disease;Rhodes, J.; Bainton, D.; Beck, P.; Campbell, H.;Lancet,1971