- Correspondence to Professor Raf Bisschops, Division of Gastroenterology, University Hospitals Leuven, KU Leuven, 49 Herestraat, 3000-Leuven, Belgium;
- Received 12 October 2016
- Revised 17 April 2017
- Accepted 21 May 2017
- Published online 11 July 2017.
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