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3. National cooperative Crohn's disease study. Results of drug treatment;Summers, R.W.; Switz, D.M.; Sessions, J.T.;Gastroenterology,1979
4. Effect of sulphasalazine in patients with active Crohn's disease. A controlled double blind trial;PAM, Van Hees; PH, Van Elteren; HJJ, Van Lier; JHM, Van Jongeren,1981
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