1. Institute of Animal Experimentation, Kurume University School of Medicine, Fukuoka 830-0011, Japan
2. Department of Physiology, Kurume University School of Medicine, Fukuoka 830-0011, Japan
3. Division of Endocrinology and Metabolism, Kurume University School of Medicine, Fukuoka 830-0011, Japan
4. Laboratory of Veterinary Clinical Pathology, Department of Veterinary Medicine, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan