- Prophylaxis of postoperative relapse in Crohn's disease with mesalamine: European Cooperative Crohn's Disease Study VI. Lochs, H., Mayer, M., Fleig, W.E., Mortensen, P.B., Bauer, P., Genser, D., Petritsch, W., Raithel, M., Hoffmann, R., Gross, V., Plauth, M., Staun, M., Nesje, L.B. Gastroenterology (2000)