- Correspondence to Professor Anna Mae Diehl, Division of Gastroenterology, Department of Medicine, Duke University Medical Center, 595 LaSalle Street, Snyderman Building, Suite 1073, Durham, NC 27710, USA;
- Received March 31, 2014
- Revised July 1, 2014
- Accepted July 7, 2014
- First published July 22, 2014.
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