- 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 August 27, 2013
- Revised September 23, 2013
- Accepted October 9, 2013
- First published October 30, 2013.
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