1. Births: final data for 2001;Martin;Natl. Vital Stat. Rep.,2002
2. Vaginal infection and preterm labour;McDonald;Br. J. Obstet. Gynaecol.,1991
3. Infection in the pathogenesis of preterm labour;Romero;Semin. Perinatol.,1988
4. A case-control study of chorioamnionic infection and histologic chorioamnionitis in prematurity;Hillier;N. Engl. J. Med.,1988
5. Histologic chorioamnionitis and preterm delivery in different patient populations;Mueller-Heubach;Obstet. Gynecol.,1990