| http://www.w3.org/ns/prov#value | - Exclusion criteria at enrollment included the following: known multiple gestation, intrauterine fetal demise, major congenital abnormalities, active pulmonary disease other than asthma, inability to schedule an ultrasound for gestational age confirmation, gestational age 26 weeks or more at intake, or participation in the asthma randomized clinical trial or other interventional studies.
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