Ratib Osman, Perloff Joseph K, Child John S
Department of Radiological Sciences and the Ahmanson/UCLA Adult Congenital Heart Disease Center, the David Geffen School of Medicine at UCLA, Los Angeles, California 90095-1679, USA.
Circulation. 2004 Feb 10;109(5):671. doi: 10.1161/01.CIR.0000115643.50179.6E.