A model-based prediction for transvaginal ultrasonographic identification of early intrauterine pregnancy.

Shapiro BS, Escobar M, Makuch R, Lavy G, DeCherney AH. A model-based prediction for transvaginal ultrasonographic identification of early intrauterine pregnancy. Am J Obstet Gynecol. 1992 May; 166(5):1495-500.

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