Benefits of left ventricular endocardial pacing comparing failed implants and prior non-responders to conventional cardiac resynchronization therapy: A subanalysis from the ALSYNC study. - Biffi, Mauro; Defaye, Pascal; Jaïs, Pierre; Ruffa, Franco; Leclercq, Christophe; Gras, Daniel; Yang, Zhongping; Gerritse, Bart; Ziacchi, Matteo; Morgan, John M. (International Journal of Cardiology, 2018)