1. From the Departments of Cardiology (M.T., U.I., K.S.), Clinical Immunology (J.I.M., S.K.), and Medical Biology and Parasitology (T.K.) and the Division of Hemopoiesis (S.I.K.), Institute of Hematology, Jichi Medical School, Tochigi, and the Second Department of Internal Medicine (Y.I.T.), University of Tohoku, Miyagi, Japan.