Mesalamine capsules for the treatment of active Crohn's disease: results of a 16-week trial. Pentasa Crohn's Disease Study Group. - Singleton,J.W.; Hanauer,S.B.; Gitnick,G.L.; Peppercorn,M.AW.; Robinson,M.G.; Wrube,L.D.; Krawitt,E.L. (Gastroenterology, 1993)