Pulmonary angiography, ventilation lung scanning and venography for clinically suspected pulmonary embolism with abnormal perfusion lung scan - Hull, R; Hirsh, J; Carter, C; Jay, R; Dodd, P E; Oekellbrd, P; Coates, G; Gill, G; Turpie, G; Doyle, D; Butler, I I; Raskoh, G (Ann Int Med, 1983)