JY: Writing—original draft. JG and YX: Writing—review & editing, Investigation, Supervision. All authors agreed to submit to the current journal; gave final approval of the version to be published; and agreed to be accountable for all aspects of the work.
Conflicts of interest
Prof. Jinsheng Guo and Youhua Xie who are Guest Editors of Exploration of Digestive Diseases, had no involvement in the decision-making or the review process of this manuscript.
Ethical approval
Not applicable.
Consent to participate
Not applicable.
Consent to publication
Not applicable.
Availability of data and materials
All the citations included in this manuscript are available upon request by contact with the corresponding author.
Funding
This work was funded by the National Fund of Nature Science of P.R. China [91129705, 81070340, 81971921] and Shanghai Pujiang Talent Program [09PJ1402600]. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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