Correction to: BMC Gastroenterol (2021) 21:113 https://doi.org/10.1186/s12876-021-01690-z

In the original publication [1] a contribution statement was accidentally removed during the publication process.

This statement is as followed:

Eun Jeong Gong and Li-chang Hsing contributed equally to this work.

The original article has been updated. We apologize to the authors and readers for the inconvenience.