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Chlamydial infection and unplanned pregnancy in women with ready access to health care.
Interpregnancy Interval and the Risk of Premature Infants.
Interpregnancy interval and the risk of premature infants.
Risk of Low Birth Weight Infants Among Black and White Parents.
Risk of low birth weight infants among black and white parents.
Fetal catecholamine release in response to labor and delivery.