Sensitivity and specificity of QRS duration to predict acute benefit in heart failure patients with ventricular resynchronization. - Kadhiresan, V.; Vogt, J.; Auricchio, A.; Butter, C.; Stellbrink, C.; Kramer, A.; Spinelli, J.; Ding, J.; Liu, L.; Doelger, A. (European Journal of Heart Failure, 2000)