1. Graduate School of Medicine; Kobe University; Kobe 650-0017 Japan
2. Department of Cellular Neurobiology; Brain Research Institute; Niigata University; Niigata 951-8585 Japan
3. Department of Medical Biology; Akita University Graduate School of Medicine; Akita 010-8543 Japan
4. Division of Dermatology; Tohoku Medical and Pharmaceutical University; 1-12-1 Fukumuro Miyagino-ku Sendai 983-8512 Japan
5. Education and Research Support Center; Gunma University Graduate School of Medicine; Maebashi 371-8511 Japan
6. Biosignal Research Center; Kobe University; Kobe 657-8501 Japan