1Department of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN
Correspondence: Xiao Jing Wang, MD, Mayo Clinic, 200 First St SW, Rochester, MN 55905 (Wang.email@example.com).
Received May 10, 2019
Accepted September 23, 2019
Online date: October 22, 2019
This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.