First- vs second-trimester ultrasound: the effect on pregnancy dating and perinatal outcomes. [electronic resource]
Producer: 20080708Description: 703.e1-5; discussion 703.e5-6 p. digitalISSN:- 1097-6868
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Publication Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't
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