1. Department of Medicine, Jutendo University Izu-Nagaoka Hospital, 1129 Nagaoka, Izu-Nagaoka-cho, Tagata-gun, Shizuoka 410–22, Tokyo 113, Japan
2. Department of Internal Medicine and Rheumatology, Tokyo 113, Japan
3. Department of Internal Medicine, Jutendo University Izu-Nagaoka Hospital, 1129 Nagaoka-cho, Izu-Nagaoka, Tagata-gun, Shizuoka 410-22, Japan
4. Department of Nephrology, Jutendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113, Japan