1Division of Gastroenterology and Hepatology, University of North Carolina Center for Functional GI and Motility Disorders, Chapel Hill, North Carolina, USA. Correspondence: Douglas A. Drossman, MD, Division of Gastroenterology and Hepatology, University of North Carolina Center for Functional GI and Motility Disorders, 4150 Bioinformatics Building CB7080, Chapel Hill, North Carolina 27599, USA. E-mail: [email protected]
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Douglas A. Drossman (2009) studied this question.
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