Cardiac Resynchronization Therapy in Patients With Heart Failure and Narrow QRS Complexes

B. Tayal, III Gorcsan J., J.J. Bax, N. Risum, N.T. Olsen, J.P. Singh, W.T. Abraham, J.S. Borer, K. Dickstein, D. Gras, H. Krum, J. Brugada, M. Robertson, I. Ford, J. Holzmeister, F. Ruschitzka, P. Sogaard