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Best Practice & Research Clinical Gastroenterology > 2012 > 26 > 6 > 803-818
The Journal of Pediatrics > 2003 > 143 > 2 > 171-179
Best Practice & Research Clinical Gastroenterology > 2012 > 26 > 6 > 803-818
The Journal of Pediatrics > 2003 > 143 > 2 > 171-179