CMR quantification of aortic regurgitation in asymptomatic patients with significant aortic regurgitation: prediction of clinical outcome - Christiansen Jonathan P; Banning Adrian P; Francis Jane M; Karamitsos Theodoros D; Greenwood John P; Mohiaddin Raad; D'Arcy Jo; Myerson Saul G; Neubauer Stefan (Journal of Cardiovascular Magnetic Resonance, 2011)