https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-117 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-121 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-119 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-125 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-127 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-131 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-116 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-120 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-118 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-122 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-124 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-128 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-123 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-129 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-126 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-130 https://bmcgastroenterol.biomedcentral.com/articles/10.1186/1471-230X-11-132