The impact of cardiac resynchronization therapy on diastolic parameters and mitral regurgitation: echocardiographic analysis of ultrasound-based left ventricular endocardial pacing system. - Wilson R; Sharma D; James S; Eguchi S; Orihara Y; Navas V; Bhardwaj R; Pfeiffer M; Kubo SH (Frontiers in cardiovascular medicine, 2026)