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Clinical Gastroenterology and Hepatology > 2011 > 9 > 7 > 617-623.e1
Annals of Epidemiology > 2009 > 19 > 7 > 468-483
Clinical Gastroenterology and Hepatology > 2011 > 9 > 7 > 617-623.e1
Annals of Epidemiology > 2009 > 19 > 7 > 468-483