1. Department of Neuroscience, The Jikei University School of Medicine, Minato, Tokyo, Japan;
2. Center for Neuroscience of Pain, The Jikei University School of Medicine, Minato, Tokyo, Japan;
3. Research Fellow of Japan Society for the Promotion of Science, Tokyo, Japan;
4. Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan; and
5. Nagoya University Graduate School of Medicine, Nagoya, Japan