Geirsson RT (1991). “Ultrasound instead of last menstrual period as the basis of gestational age assignment”. Ultrasound in Obstetrics and Gynecology. 1 (3): 212–9. doi:10.1046/j.1469-0705.1991.01030212.x. PMID12797075. [1]
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Geirsson RT (1991). “Ultrasound instead of last menstrual period as the basis of gestational age assignment”. Ultrasound in Obstetrics and Gynecology. 1 (3): 212–9. doi:10.1046/j.1469-0705.1991.01030212.x. PMID12797075. [1]
Wilcox AJ, Baird DD, Weinberg CR (1999). “Time of implantation of the Conceptus and loss of pregnancy”. New England Journal of Medicine. 340 (23): 1796–1799. doi:10.1056/NEJM199906103402304. PMID10362823.
Geirsson RT (1991). “Ultrasound instead of last menstrual period as the basis of gestational age assignment”. Ultrasound in Obstetrics and Gynecology. 1 (3): 212–9. doi:10.1046/j.1469-0705.1991.01030212.x. PMID12797075. [1]
