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568: Risk factors for spontaneous preterm birth in African-..:

Timofeev, Julia ; Singh, Jasbir ; Istwan, Niki..
American Journal of Obstetrics and Gynecology.  206 (2012)  1 - p. S258-S259 , 2012
Link: https://doi.org/10.1016/j.ajog.2011.10.586