![Noninvasive evaluation of the ratio of pulmonary to systemic flow in atrial septal defect by duplex Doppler echocardiography]()
Noninvasive evaluation of the ratio of pulmonary to systemic flow in atrial septal defect by duplex Doppler echocardiographyKitabatake, A.; Inoue, M.; Asao, M.; Ito, H.; Masuyama, T.; Tanouchi, J.; Morita, T.; Hori, M.; Yoshima, H.; Ohnishi, K. · Circulation · 1984