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Toru ANZAI
Epizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4 Shiba, Kokubunji-machi, Shimotsuga-gun, Tochigi 329-04, Japan
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Masanobu KAMADA
Epizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4 Shiba, Kokubunji-machi, Shimotsuga-gun, Tochigi 329-04, Japan
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Takumi KANEMARU
Epizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4 Shiba, Kokubunji-machi, Shimotsuga-gun, Tochigi 329-04, Japan
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Shigeo SUGITA
Epizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4 Shiba, Kokubunji-machi, Shimotsuga-gun, Tochigi 329-04, Japan
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Akira SHIMIZU
Department of Animal Hygiene, Faculty of Agriculture, Kobe University, Kobe-shi, Hyogo 657, Japan
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Toru HIGUCHI
Mitsuishi Animal Clinic Center, Agriculture Mutual Aid Association of Hidaka District, 200 Higashi-hohrai, Mitsuishi-cho, Mitsuishi-gun, Hokkaido 059-323, Japan