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Kenji TSUKANO
School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimati, Bunnkyoudai, Ebetsu, Hokkaido 069–8501, Japan Donan-NOSAI, Donan Agricultural Mutual Relief Association, 25–16 Misugicho, Yakumo, Futami-gun, Hokkaido 049–3114, Japan
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Kazuyuki SUZUKI
School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimati, Bunnkyoudai, Ebetsu, Hokkaido 069–8501, Japan College of Veterinary Medical Science, Ohio State University, 601 Vernon L. Tharp St., Columbus, OH 43210–1089, U.S.A.
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Toshio SHIMAMORI
School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimati, Bunnkyoudai, Ebetsu, Hokkaido 069–8501, Japan Ishikari-NOSAI, Ishikari Agricultural Mutual Relief Association, 7–4–1 Seiryu, Chitose, Hokkaido 066–0081, Japan
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Ayano SATO
School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimati, Bunnkyoudai, Ebetsu, Hokkaido 069–8501, Japan
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Katsunori KUDO
School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimati, Bunnkyoudai, Ebetsu, Hokkaido 069–8501, Japan Ishikari-NOSAI, Ishikari Agricultural Mutual Relief Association, 7–4–1 Seiryu, Chitose, Hokkaido 066–0081, Japan
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Ryuji ASANO
Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252–8510, Japan
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Tadaharu AJITO
Central Research Laboratories, Nippon Zenyaku Kogyo Co., Ltd., 1–1 Aza Tairanoue, Sasagawa, Asakamachi, Koriyama, Fukushima 963–0196, Japan
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Jeffrey LAKRITZ
College of Veterinary Medical Science, Ohio State University, 601 Vernon L. Tharp St., Columbus, OH 43210–1089, U.S.A.
