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Left ventricular mechanical dyssynchrony in patients with impaired left ventricular function undergoing gated SPECT myocardial perfusion imaging Maria João Vidigal Ferreira, Rodolfo Silva, Nuno Cabanelas, Maria João Cunha, Domingos Ramos, Anabela Albuquerque, Rogério Teixeira, Ana Paula Moreira, Gracinda Costa, João Lima, Luís Augusto Providência