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Retrospective Cohort Study
Jiyoung Yoon, Dae Sung Kim, Ye-Jee Kim, Jin Wook Lee, Seung Wook Hong, Ha Won Hwang, Sung Wook Hwang, Sang Hyoung Park, Dong-Hoon Yang, Byong Duk Ye, Jeong-Sik Byeon, Seung-Jae Myung, Suk-Kyun Yang 
World J Gastroenterol 27(19):2353-2365. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2353
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