Fetal heart assessment in the first trimester of pregnancy: influence of crown-rump length and maternal body mass index

David Baptista Silva Pares; Angélia Iara Felipe Lima; Edward Araújo Júnior; Luciano Marcondes Machado Nardozza; Wellinton P. Martins; Antônio Fernandes Moron

Braz J Cardiovasc Surg. 2013;28(4):477-481