I de Haas1, B L Harlow, D W Cramer
1Obstetrics and Gynecology Epidemiology Center, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.
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Prior preterm delivery, smoking, and low prepregnancy weight are key risk factors for preterm birth. Maternal diethylstilbestrol exposure and prior induced abortions also increase risk.
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