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APA Citation
Gnanapragasam, J. P., Houston, A. B., Doig, W. B., Fraser, R., Lilley, S., Murtagh, E., & Olafsson, G. (1991). influence of colour Doppler echocardiography on the ultrasonic assessment of congenital heart disease: a prospective study.. Heart, 66(3), 238–243. http://access.bl.uk/ark:/81055/vdc_100144734045.0x00002f