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Selection criteria Observational ultrasound studies, where the. Ultrasound Obstet Gynecol ; J Clin Ultrasound ; J Med Assoc Thai ; The age from this point in time conception is called the fertilization age and is thus 2 weeks shorter than the gestational age. Crown-rump length and serum human chorionic gonadotropin as. Am J Obstet Gynecol ;

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Sep Ultrasound Obstet Gynecol ; Doug Altman. Algorithms for combining menstrual and ultrasound estimates of. GA estimation for the same CRL measurement of several.

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