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Engelhardt EL, Sankar M, Wu-Wang CY, Thomas MR, Walker WR, Neu J.Engelhardt EL, et al.J Pediatr Gastroenterol Nutr. 1991 May;12(4):494-500. doi: 10.1097/00005176-199105000-00014.J Pediatr Gastroenterol Nutr. 1991.PMID: 1865285