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Talley, Nicholas J., Abreu, Maria T., Achkar, Jean-Paul, Bernstein, Charles N., Dubinsky, Marla C., Hanauer, Stephen B., Kane, Sunanda V., Sandborn, William J., Ullman, Thomas A., Moayyedi, Paul. Nature Publishing Group; 2011. An evidence-based systematic review on medical therapies for inflammatory bowel disease.