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Opinion Review
Minireviews
Sasan Partovi, Xin Li, Eunice Moon, Dustin Thompson 
World J Gastroenterol 26(4):383-392. Published online Jan 28, 2020. doi: 10.3748/wjg.v26.i4.383
Retrospective Cohort Study
Jung Min Moon, Eun Ae Kang, Kyungdo Han, Seung Wook Hong, Hosim Soh, Seona Park, Jooyoung Lee, Hyun Jung Lee, Jong Pil Im, Joo Sung Kim 
World J Gastroenterol 26(4):404-415. Published online Jan 28, 2020. doi: 10.3748/wjg.v26.i4.404
Retrospective Study
Akiko Shida, Takashi Fukuyama, Nobue Futawatari, Haruki Ohmiya, Yoshinobu Ichiki, Tetsuro Yamashita, Yatsushi Nishi, Noritada Kobayashi, Hitoshi Yamazaki, Masahiko Watanabe, Yoshihito Takahashi 
World J Gastroenterol 26(4):424-432. Published online Jan 28, 2020. doi: 10.3748/wjg.v26.i4.424
Systematic Reviews
Case Report
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