- Correspondence to Dr Andrew T Chan, Division of Gastroenterology, Gastrointestinal Unit, Massachusetts General Hospital, 55 Fruit Street, GRJ-728A, Boston, MA 02114, USA;
- Revised 24 November 2011
- Accepted 30 November 2011
- Published in print 1 December 2012.
- Published online 9 November 2012.
- Published first 11 January 2012.
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