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*Koumei SHIRASUNA
Department of Animal Science, Faculty of Agriculture, Tokyo University of Agriculture
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Ayae OZEKI
Department of Animal Science, Faculty of Agriculture, Tokyo University of Agriculture
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Hironori TAKAHASHI
Department of Obstetrics and Gynecology, Jichi Medical University
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Akihide OHKUCHI
Department of Obstetrics and Gynecology, Jichi Medical University