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Corresponding author. Qiang Cai, Division of Digestive Diseases, Emory University School of Medicine, Emory Clinic ‘B’, 1365 Clifton Rd, 1st Floor, Atlanta, GA 30322, USA. Tel: +1–404–778–3184; Email: qcai@emory.edu.
An abstract of this study was presented at the proceedings of the 2016 American College of Gastroenterology conference in Las Vegas, NV, and received a Presidential Poster Award.
Conflict of interest statement: none declared.
© The Author(s) 2017.