ISUOG Practice Guidelines (updated): sonographic screening examination of the fetal heart. (4th March 2013) - Carvalho, J. S.; Allan, L. D.; Chaoui, R.; Copel, J. A.; DeVore, G. R.; Hecher, K.; Lee, W.; Munoz, H.; Paladini, D.; Tutschek, B.; Yagel, S.