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HIROOMI ISHIKAWA
Department of Obstetrics and Gynecology, Nippon Medical School, Bunkyoku, Tokyo 113, Japan
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KEIJI SUGIMOTO
Department of Anatomy, Nippon Medical School, Bunkyoku, Tokyo 113, Japan
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KAZUO YAMASHITA
Department of Anatomy, Nippon Medical School, Bunkyoku, Tokyo 113, Japan
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TSUTOMU ARAKI
Department of Obstetrics and Gynecology, Nippon Medical School, Bunkyoku, Tokyo 113, Japan