scientific article
author: Keitaro Matsuo, Ryo Yamada, Akio Oishi, Kazuo Tajima, Hideo Nakanishi, Norimoto Gotoh, Hisako Hayashi, Kenji Yamashiro, Masaaki Saito, Tomohiro Iida, Fumihiko Matsuda, Atsushi Otani
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