Pulmonary angiography, ventilation lung scanning and venography for clinically suspected pulmonary embolism with abnormal perfusion lung scan - Hull, R D; Hirsh, J; Carter, C J; Jay, R M; Dodd, P E; Ockelford, P A; Coates, G; Gill, G J; Turpie, A G; Doyle, D J; Biiller, H R; Raskob, G E (Ann Intern Med, 1983)