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14. Al-Gobari M, El Khatib C, Pillon F, Gueyffier F. â-blockers for the prevention of sudden cardiac death in heart failure patients: A meta-analysis of randomized controlled trials. BMC Cardiovasc Disord [Internet]. 2013 [citado 22 May 2017];13:52. Disponible en: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3716800/pdf /1471-2261-13-52.pdf