Prospective comparison of vaginal and abdominal sonography in normal early pregnancy.

Pennell RG, Needleman L, Pajak T, Baltarowich O, Vilaro M, Goldberg BB, Kurtz AB. Prospective comparison of vaginal and abdominal sonography in normal early pregnancy. J Ultrasound Med. 1991 Feb; 10(2):63-7.

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