Author(s) affiliations:Akira Shimada1, Yoichi Oikawa1, Yoshifumi Yamada1, Yoshiaki Okubo1 and Shosaku Narumi2
1Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
2Department of Molecular Preventive Medicine, University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan.