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28. Embryonic heart rate as a predictor of first-trimester pregnancy loss in infertility patients after in vitro fertilization. Rauch ER, Schattman GL, Christos PJ, Chicketano T, Rosenwaks Z. Fertil Steril; 2009 Jun; 91(6):2451-4. PubMed ID: 18656184 [Abstract] [Full Text] [Related]
29. Embryonic heart rates: development in early first trimester and clinical evaluation. Tezuka N, Sato S, Kanasugi H, Hiroi M. Gynecol Obstet Invest; 1991 Jun; 32(4):210-2. PubMed ID: 1778511 [Abstract] [Full Text] [Related]
30. Sonography of pregnancies with first-trimester bleeding and a viable embryo: a study of prognostic indicators by logistic regression analysis. Falco P, Milano V, Pilu G, David C, Grisolia G, Rizzo N, Bovicelli L. Ultrasound Obstet Gynecol; 1996 Mar; 7(3):165-9. PubMed ID: 8705406 [Abstract] [Full Text] [Related]
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34. [The use of ultrasonography in the prediction of first-trimester abortion]. Levi D'Ancona R, Pinzano R, Maso GP, Ricci G, Bogatti P, Alberico S. Minerva Ginecol; 1994 Mar; 46(3):63-7. PubMed ID: 8015700 [Abstract] [Full Text] [Related]
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