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Yu, Young-Dong; Kim, Dong-Sik; Byun, Geon-Young; Suh, Sung-Ock
Yu, Young-Dong; Kim, Dong-Sik; Byun, Geon-Young; Seo, Sung-Ock
Yu, Young-Dong; Kim, Dong-Sik; Byun, Geon-Young; Park, Beom-Jin; Suh, Sung-Ock