Romero Roberto, Chaiworapongsa Tinnakorn, Kuivaniemi Helena, Tromp Gerard
Perinatology Research Branch, National Institute of Child Health & Human Development/National Institutes of Health/Department of Health and Human Services, Bethesda, MD, USA.
Am J Obstet Gynecol. 2004 Jun;190(6):1509-19. doi: 10.1016/j.ajog.2004.01.002.