Differential branch pulmonary artery regurgitant fraction identifies patients with unilateral stenosis associated with relatively elevated pulmonary vascular resistance in the contralateral lung after repair of conotruncal anomalies - Weinberg Paul M; Cosulich Michael T; Liu Timothy I; Gillespie Matthew J; Whitehead Kevin K; Harris Matthew A; Fogel Mark A (Journal of Cardiovascular Magnetic Resonance, 2009)