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American College of Gastroenterology
American Gastroenterological Association, The
American Society for Gastrointestinal Endoscopy
American Society of Transplantation
PubMed
Medical Center
East Carolina University (ECU)
Baptist Medical Center
ClinicalTrials.gov
National Institute of Diabetes & Digestive & Kidney Diseases (NIDDK)
Massachusetts Medical Society
MedlinePlus
Medscape
National Institutes of Health (NIH)
North American Society for Pediatric Gastroenterology, Hepatology & Nutrition
Wiley Open Access
Thomson Healthcare
UNC Healthcare
Society of Gastroenterology Nurses & Associates
BaiSheDent