https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-11 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-6 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-8 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-1 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-3 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-7 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-9 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-2 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-4 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-10 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-12-5