A comparative study of the diagnostic performance of amniotic fluid glucose, white blood cell count, interleukin-6, and gram stain in the detection of microbial invasion in patients with preterm premature rupture of membranes - Romero,R.; Yoon,B.H.; Mazor,M.; Gomez,R.; Gonzalez,R.; Diamond,M.P.; Baumann,P.; Araneda,H.; Kenney,J.S.; Cotton,D.B.; Sehgal,P. (Am J Obstet Gynecol, 1993)