Yutaka Kawarabayasi, Mituhiro Sawada, Hiroshi Horikawa, Yuji Haikawa, Yumi Hino, Saori Yamamoto, Mitsuo Sekine, Sin-Ichi Baba, Hiroki Kosugi, Akira Hosoyama, Yo
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Yutaka Kawarabayasi (1998) studied this question.