title: Reply: Echocardiographic Substrate for Biventricular Pacing.
authors.forename: Niels
authors.initials: N
authors.lastname: Risum
authors.forename: Joseph
authors.initials: J
authors.lastname: Kisslo
authors.forename: John
authors.initials: J
authors.lastname: Gorcsan
authors.forename: Peter
authors.initials: P
authors.lastname: Sogaard
mesh_terms: D002304:Cardiac Pacing, Artificial; D058406:Cardiac Resynchronization Therapy; D004452:Echocardiography; D006333:Heart Failure; D006801:Humans