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=2 Cases of Gastrointestinal Amyloidosis Presenting Massive Gastrointestinal Bleeding in Predialytic Chronic RenalFailure PatientsSoo-Jeong Yu, M.D., Dong-Jin Oh, M.D.Jae-Young Choi, M.D., Suk-Hee Yu, M.D.Hyong-Jun Kim, M.D. and Tae-Jin Lee, M.D.*