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Case Control Study
Retrospective Cohort Study
Retrospective Study
Selvi Thirumurthi, Gottumukkala S Raju, Mala Pande, Joseph Ruiz, Richard Carlson, Katherine B Hagan, Jeffrey H Lee, William A Ross 
World J Gastrointest Endosc 9(4):177-182. Published online Apr 16, 2017. doi: 10.4253/wjge.v9.i4.177
Observational Study