- Correspondence to Dr Chaysavanh Manichanh, Department of Gastroenterology, Vall d'Hebron Research Institute, Pg Vall d'Hebron, Barcelona 119-129, Spain;
- Received 14 October 2016
- Revised 22 December 2016
- Accepted 28 December 2016
- Published online 7 April 2017.
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