1. The Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Tokyo, Japan
2. Tokyo Women's Medical College, Tokyo, Japan
3. Teikyo University School of Medicine, Tokyo, Japan
4. Toranomon Hospital, Tokyo, Japan
5. Showa University School of Medicine, Yokohama, Japan
6. Institute of Medical Science, University of Tokyo, Tokyo, Japan
7. Tokyo Jikeikai Medical College, Tokyo, Japan
8. Kanto Rosai Hospital, Kawasaki, Japan