1. Department of Neurophysiology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan.
2. Second Division, Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan.
3. Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine, Maebashi, Gunma 371-8511, Japan.
4. Laboratory of Information Biology, Graduate School of Information Sciences, Tohoku University, Sendai, Miyagi 980-8579, Japan.
5. Department of Family and Community Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan.