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English: DuBose TJ, DuBose TJ, Cunyus JA, & Johnson L; Embryonic Heart Rate and Age. J Diagn Med Sonography 1990; 6:151-157. Schats R, Jansen CAM, & Waldimiroff JW; "Embryonic heart activity: appearance and development in early human pregnancy"; Brit J Obstet and Gynaecol, 1990; 97:989-994. Qasim SM, Sachdev R, Trias A, et al; The predictive value of first trimester embryonic heart rates in fertility patients. Obstetrics & Gynecology. 89(6):934-6, 1997 June; DuBose TJ; FETAL SONOGRAPHY, Chapter 12 Heart Rate; W. B. Saunders Co. 1996; p. 274-263.
Date 7 January 2006 (first version); 30 November 2009 (last version)
Source Transferred from en.wikipedia
Author Original uploader was DuBose at en.wikipedia


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