1. Department of Health Sciences (Y.T.), School of Medicine, Kanazawa University, Kanazawa 920, Japan
2. Second Department of Internal Medicine (Y.T., T.Y., M.D., H.M.), School of Medicine, Kanazawa University, Kanazawa 920, Japan
3. Third Department of Internal Medicine (I.M.), Fukui Medical School, Fukui 910-11, Japan