1. Second Department of Internal Medicine, Osaka City University Medical School, 1–4-3, Asahi-machi, Abeno-ku, Osaka 545-8585, Japan
2. Institute of Sumitomo Pharmaceutical Company, Osaka, Japan
3. Kobe Pharmaceutical College, 4–19-1, Motoyama-Kitamachi, Higashinada-ku, Kobe 658, Japan