1. School of Veterinary Medicine, Rakuno Gakuen University, 582 Bunkyodai-Midorimachi, Ebetsu, Hokkaido 069–8501, Japan
2. College of Veterinary Medical Science, Ohio State University, 601 Vernon L. Tharp St., Columbus, OH 43210–1089, U.S.A.
3. Endotoxin and Microbial Detection, Charles River, 1023 Wappoo Road, Suite 43B, Charleston, SC 29407, U.S.A.