- Correspondence to Philippe Marteau, Department of Digestive Diseases, Lariboisière Hospital, 2 rue Ambroise Paré, 75010 Paris, France;
- Revised 24 September 2010
- Accepted 19 October 2010
- Published in print 1 February 2011.
- Published online 4 January 2011.
- Published first 29 November 2010.
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