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Yoh-Ichi MIYAKE
Department of Veterinary Obstetrics, Faculty of Veterinary Medicine, Hokkaido University
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Shoichi ABE
Obihiro Zoological Garden
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Masao KOSUGE
Asahiyama Zoological Garden
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Hiroshi KANAGAWA
Department of Veterinary Obstetrics, Faculty of Veterinary Medicine, Hokkaido University