1. Department of Traditional Asian Medicine, Graduate School of Medicine, Tohoku University, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8574, Japan
2. Department of Ophthalmology and Visual Science, Graduate School of Medicine, Tohoku University, Sendai 980-8574, Japan
3. Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-8575, Japan
4. Research Division on Advanced Information Technology, Cyberscience Center, Tohoku University, Japan