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free resource BioMed Central https://bmcgastroenterol.biomedcentral.com/articles/10.1186/s12876-022-02259-0
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/35473586/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/35473586