Cardiovascular effects of flavanol-rich chocolate in patients with heart failure - Flammer, A J; Sudano, I; Wolfrum, M; Thomas, R; Enseleit, F; Périat, D; Kaiser, P; Hirt, A; Hermann, M; Serafini, M; Lévêques, A; Lüscher, T F; Ruschitzka, F; Noll, G; Corti, R (Eur Heart J, 2012)