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Retrospective Cohort Study
Ju Yup Lee, Kwang Bum Cho, Eun Soo Kim, Kyung Sik Park, Yoo Jin Lee, Yoon Suk Lee, Byoung Kuk Jang, Woo Jin Chung, Jae Seok Hwang 
World J Gastrointest Endosc 8(7):330-337. Published online Apr 10, 2016. doi: 10.4253/wjge.v8.i7.330
Retrospective Study
Asli Ormeci, Filiz Akyuz, Bulent Baran, Suut Gokturk, Tugrul Ormeci, Binnur Pinarbasi, Ozlem Mutluay Soyer, Sami Evirgen, Umit Akyuz, Cetin Karaca, Kadir Demir, Sabahattin Kaymakoglu, Fatih Besisik 
World J Gastrointest Endosc 8(7):344-348. Published online Apr 10, 2016. doi: 10.4253/wjge.v8.i7.344