author: Seok-Min Kang  Chang-Hwan Yoon  Eun Seok Jeon  Shung Chull Chae  Dong-Ju Choi  Byung-Su Yoo  Myeong-Chan Cho  Hyun Ah Park  Kyu-Hyung Ryu  Il-Young Oh  Chan Soon Park  Jae-Joong Kim  Jin Joo Park  Byung-Hee Oh 

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