DOI: 10.1055/s-00030576

Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics

References

Laing FC, Frates MC, Benson CB.
Ultrasound evaluation during the first trimester of pregnancy.

In: Callen PW. , ed.
Ultrasonography in Obstetrics and Gynecology. 5th ed.

Philadelphia, PA: Saunders Elsevier; 2008: 181-224

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