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SETSUKO SUEMUNE
First Department of Oral Anatomy, Hiroshima University School of Dentistry, Minamiku, Hiroshima 734, Japan
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TOSHITSUGU KAWATA
Department of Orthodontics, Hiroshima University School of Dentistry, Minamiku, Hiroshima 734, Japan
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NORIHIKO MAEDA
First Department of Oral Anatomy, Hiroshima University School of Dentistry, Minamiku, Hiroshima 734, Japan