1. Department of Medicine (T.H., F.Y., Y.K.), National Cardiovascular Center, Suita, Osaka 565-8565, Japan;
2. Research Institute (T.T., T.M., S.S., K.K.), National Cardiovascular Center, Suita, Osaka 565-8565, Japan;
3. Department of Hypertension and Cardiorenal Medicine, Dokkyo University School of Medicine (T.N.), Tochigi 321-0293, Japan;
4. Institute of Life Sciences, Kurume University (M.K.), Kurume, Fukuoka 839-0861, Japan