Mitral regurgitation recovery and atrial reverse remodeling following pulmonary vein isolation procedure in patients with atrial fibrillation: a proof of concept cardiac MRI study - Reddy Sahadev T; Belden William; Doyle Mark; Vido Diane A; Yamrozik June; Williams Ronald B; Biederman Robert W (Journal of Cardiovascular Magnetic Resonance, 2012)