1. a Institut Pasteur 5F , Health Research Foundation, Tanakamonzen-cho, Sakyo-ku, Kyoto, 606, Japan
2. b School of Pharmaceutical Sciences, Kitasato University , Shirokane, Minato-ku, Tokyo, 102, Japan
3. c Department of Medicine , Matsumoto Hospital , Chichibu, Saitama, 368-0034, Japan