scientific article
author: Koichi Matsuda, Michiaki Kubo, Jun Hata, Toshiharu Ninomiya, Yūsuke Nakamura, Takanari Kitazono, Koji Yonemoto, Yutaka Kiyohara, Tomonaga Matsushita, Setsuro Ibayashi, Mitsuo Iida, Yozo Ohnishi
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