1. School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Japan
2. Laboratory of Veterinary Pathology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
3. Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Sanuki, Japan
4. Department of Pharmaceutical Sciences, Daiichi University of Pharmacy, Fukuoka, Japan
5. Marine Mammal Institute and Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR, USA