https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-14 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-24 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-17 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-23 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-16 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-18 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-22 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-15 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-21 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-19 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-10-20