
Keywords: PTB; preterm birth; POG; period of gestation; DDT; dichlorodiphenyltrichloroethylene; DDD; dichlorodiphenyldichloroethane; DDE; dichlorodiphenyldichloroethylene; HCH; hexachlorocyclohexane; IL; interleukins; OCPs; organochlorine pesticides; PGF2α; prosta