1. Epidemiologic characteristics of preterm delivery: etiologic heterogeneity;Savitz;Am J Obstet Gynecol,1991
2. The use of amniocentesis in patients with premature rupture of membranes;Garite;Obstet Gynceol,1979
3. Chorioamnionitis in the preterm gestation;Garite;Obstet Gynecol,1982
4. Use of amniocentesis in preterm gestation with ruptured membranes;Cotton;Obstet Gynecol,1984
5. Amniocentesis for gram stain and culture in preterm premature rupture of membranes;Broekhuizen;Obstet Gynecol,1985