Long-term treatment with valsartan improved cyclic variation of the myocardial integral backscatter signal and diastolic dysfunction in hypertensive patients: the echocardiographic assessment. - Mizuta Y; Kai H; Mizoguchi M; Osada K; Tahara N; Nakaura H; Kuwahara F; Imaizumi T (Hypertension research : official journal of the Japanese Society of Hypertension, 2008)