1. National Institute for Environmental Studies, Tsukuba, Japan
2. Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
3. Department of Health Science, Oita University of Nursing and Health Science, Oita, Japan
4. Department of Hygienics, Gifu Pharmaceutical University, Gifu, Japan
5. Department of Veterinary Pathology, Faculty of Agriculture, Tottori University, Tottori, Japan