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National Institute of Allergy and Infectious Diseases.
National Jewish Medical and Research Center.
Parrish, C. Practical Gastroenterology, June 2007.
Postgraduate Medicine, January 2002.
Rakel, R. Textbook of Family Medicine. Saunders Elsevier, 2007.
Reviewed by Maryann Tomovich Jacobsen, MS, RD on October 17, 2016
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