1. The Second Dept. of Internal Medicine, Kobe University, School of Medicine
2. The Second Dept. Of Internal Medicine, Hokkaido University, School of Medicine
3. The Third Dept. of Internal Medicine, Hirosaki University, School of Medicine
4. The Third Dept. of Internal Medicine, Tohoku University, School of Medicine
5. The Third Dept. of Internal Medicine, Tokyo Medical and Dental University, School of Medicine
6. The Second Dept. of Internal Medicine, Kanazawa University, School of Medicine
7. The Third Dept. of Internal Medicine, Nagoya University, School of Medicine
8. Central Laboratory for Clinical Investigation, Kyoto Prefectural University of Medicine