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Lee T.H.; Lee J.S.; Hong S.J.; Jeon S.R.; Kwon S.H.; Kim W.J.; Kim H.G.; Cho W.Y.; Cho J.Y.; Kim J.-O., et al.
Lee T.H.; Yoon J.Y.; Paik C.N.; Choi H.S.; Jang J.-Y.; The Quality Management Committee of The Korean Society of Gastrointestinal Endoscopy