1. Klotz U: Clinical efficacy of oral 5-aminosalicylic acid in the treatment of inflammatory bowel disease. Am J Gastroenterol 80:660, 1985
2. Friedman G: Sulfasalazine and new analogues. Am J Gastroenterol 81:141?144, 1986
3. Klotz U: Clinical pharmacokinetics of sulphasalazine, its metabolites and other prodrugs of 5-aminosalicylic acid. Clin Pharmacokinet 10:285?302, 1985
4. Klotz U, Maier KE, Fischer C, Bauer KH: A new slow-release form of 5-aminosalicylic acid for the oral treatment of inflammatory bowel disease: Biopharmaceutic and clinical pharmacokinetic characteristics. Arzneim-Forsch 35:636?639, 1985
5. Azad Khan KA, Piris J, Truelove SC: An experiment to determine the active therapeutic moiety of sulphasalazine. Lancet II:892?895, 1977