- Correspondence to Professor G Cammarota, Gastroenterological Area, Fondazione Policlinico Universitario Gemelli, Università Cattolica del Sacro Cuore, Largo A. Gemelli 8, Rome 00168, Italy;
- Received 7 September 2016
- Revised 1 December 2016
- Accepted 4 December 2016
- Published online 13 January 2017.
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