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Contributors YD and ZL conceived and designed the study, XZ, HZ and YC wrote the draft. All authors final approval of the letter. XZ, HZ and YC contributed equally.
Funding This investigation was supported by the grant from National Clinical Research Center for Digestive Diseases of China (2015BAI13B08). HZ is supported by Youth Start-up Fund of Changhai Hospital (Grant No. 2019QNA01). YD is supported by Shanghai Health Commission advanced appropriate technology promotion project (2019SY001).
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Provenance and peer review Not commissioned; internally peer reviewed.