1. Department of Molecular Biology and Applied Physiology, Tohoku University School of Medicine, Aoba-ku, Sendai, Miyagi 980-8574, Japan
2. Second Department of Internal Medicine, Tohoku University School of Medicine, Aoba-ku, Sendai, Miyagi 980-8574, Japan
3. Department of Pathology, Tohoku University School of Medicine, Aoba-ku, Sendai, Miyagi 980-8574, Japan
4. First Department of Internal Medicine, Tohoku University School of Medicine, Aoba-ku, Sendai, Miyagi 980-8574, Japan