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Mucosal Immunology Laboratory, Harvard Clinical Nutrition Research Center, Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital for Children, Boston, Massachusetts, USA Correspondence to W.A. Walker, MD, Mucosal Immunology Laboratory, Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital for Children, 114 16th Street (114-3503), Charlestown, MA 02129-4404, USA. E-mail: [email protected]
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W. Allan Walker (2012) studied this question.
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