- Correspondence to Professor Jean-Frédéric Colombel, The Dr Henry D Janowitz Division of Gastroenterology, Icahn School of Medicine at Mount Sinai, 1 Gustave Levy Place, New York, NY 10029, USA;
- Received 24 January 2013
- Revised 15 March 2013
- Accepted 20 March 2013
- Published online 8 October 2013.
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