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Tsuyoshi Usagawa
Kumamoto University, 2–39–1 Kurokami, Kumamoto, 860–8555 Japan
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Hirokazu Shimada
Kumamoto University/Kyushu Matsushita Electric Works, 2–4–16 Momochihama, Sawara-ku, Fukuoka, 814–0001 Japan
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Yoshiaki Sawada
Kumamoto University, 2–39–1 Kurokami, Kumamoto, 860–8555 Japan
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Yoshifumi Chisaki
Kumamoto University, 2–39–1 Kurokami, Kumamoto, 860–8555 Japan
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Masanao Ebata
Kumamoto University, 2–39–1 Kurokami, Kumamoto, 860–8555 Japan