Paradoxical prolongation of QT interval during exercise in patients with HCM: Cellular mechanisms and implications for diastolic function by Coppini, R, Beltrami, M, Doste, R, Bueno Orovio, A, Ferrantini, C, Vitale, G, Manuel Pioner, J, Santini, L, Argirò, A, Berteotti, M, Mori, F, Marchionni, N, Stefàno, P, Cerbai, E, Poggesi, C, Olivotto, I