An evidence-based approach to studies of the natural history of gastrointestinal diseases: Recurrence of symptomatic Crohn's disease after surgery☆☆☆★
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☆ Address requests for reprints to: James D. Lewis, M.D., MSCE, University of Pennsylvania, Center for Clinical Epidemiology and Biostatistics, 7th Floor Blockley Hall, 423 Guardian Drive, Philadelphia, PA 19104-6021. e-mail: jlewis@cceb.med.upenn.edu; fax: (215) 573-5325.
☆☆ Dr. Lewis has served as a paid consultant to GlaxoSmithKline, Centocor, and Shire, and he has received research support from GlaxoSmithKline and Centocor. Dr. Lichtenstein has received honoraria from Centocor, GlaxoSmithKline, Shire Pharmaceuticals, AstraZeneca, Procter and Gamble, Salix, and Prometheus Laboratories, and he has received research support from Centocor. Dr. Schoenfeld has served as a paid consultant to AstraZeneca and Procter and Gamble.
★ 1542-3565/03/$30.00
PII: S1542-3565(03)70040-8
© 2003 American Gastroenterological Association. Published by Elsevier Inc. All rights reserved.


