Golwala HB, Thadani U, Liang L, Stavrakis S, Butler J, Yancy CW, Bhatt DL, Hernandez AF, Fonarow GC. Use of hydralazine-isosorbide dinitrate combination in African American and other race/ethnic group patients with heart failure and reduced left ventricular ejection fraction. J Am Heart Assoc. 2013 Aug 21; 2(4):e000214.