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Influence of left ventricular systolic function on the long-term benefit of beta-blockers after ST-segment elevation myocardial infarction Jesús Velásquez-Rodríguez, Vanesa Bruña, Lourdes Vicent, Felipe Díez-Delhoyo, María Jesús Valero-Masa, Iago Sousa-Casasnovas, Miriam Juárez, Carolina Devesa, Francisco Fernández-Avilés, Manuel Martínez-Sellés