2000 | ¹°¸®ÇÐ Çлç, ¼¿ï´ëÇб³ ¹°¸®ÇÐ 2002 | ¹°¸®ÇÐ ¼®»ç, University of Michigan - Ann Arbor 2003 | ¼öÇÐ ¼®»ç, University of Michigan - Ann Arbor 2006 | ¼öÇÐ ¹Ú»ç,University of Michigan - Ann Arbor
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