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National Institutes of Health (NIH)
http://www.nih.gov
NIH is an Agency under the U.S. Department of Health and Human Services, and offers health information and scientific resources.

North American Society for Pediatric Gastroenterology, Hepatology and Nutrition (NASPGHAN)
http://www.naspghan.org/
NASPGHAN works to help children and adolescents with digestive disorders.