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Lin WR, Lin DY, Tai DI, Hsieh SY, Lin CY, Sheen IS, Chiu CT (2008). "Prevalence of and risk factors for gallbladder polyps detected by ultrasonography among healthy Chinese: analysis of 34,669 cases". Journal of Gastroenterology and Hepatology. 23 (6). ss. 965-9. doi:10.1111/j.1440-1746.2007.05071.x. PMID17725602.