Prognostic value of echocardiographic right/left ventricular end-diastolic diameter ratio in patients with acute pulmonary embolism: results from a monocenter registry of 1,416 patients - Frémont, B; Pacouret, G; Jacobi, D; Puglisi, R; Charbonnier, B; de Labriolle, A (Chest, 2008)