1. Department of Environmental Biochemistry, Graduate School of Medicine, Chiba University, Inohana, Chuou-ku, Chiba 260-8670, Japan
2. Department of Clinical Medicine, Faculty Education, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
3. Department of Physiology, Faculty of Basic Medical Sciences, Chengde Medical University, Chengde 067000, P.R. China