1. Laboratory of Veterinary Pharmacology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
2. Pet Health & Food Division, Iskara Industry Co., Ltd., 1-14-2, Nihonbashi, Chuo-ku, Tokyo 103-0027, Japan