Nazario-Redondo CN-R, Ventura-Laveriano J, Flores-Molina Édgar, Ventura W. Importance of ultrasound evaluation at 11+0 - 13+6 weeks of pregnancy. An update. An Fac med [Internet]. 2011 Sep. 30 [cited 2024 Jul. 17];72(3):211-5. Available from: https://revistasinvestigacion.unmsm.edu.pe/index.php/anales/article/view/1070