Olmesartan reverses not only vascular endothelial dysfunction but cardiac diastolic dysfunction in hypertensive patients with heart failure with preserved ejection fraction — ORION study. (1st September 2015) - Yamamoto, Eiichiro; Ohba, Keisuke; Hirata, Yoshihiro; Tokitsu, Takanori; Fujisue, Koichiro; Sugamura, Koichi; Kaikita, Koichi; Hokimoto, Seiji; Sugiyama, Seigo; Ogawa, Hisao