G. C. McKeeman, J. E. Ardill, C. M. Caldwell, A. J. Hunter and N. McClure. Soluble vascular endothelial growth factor receptor-1 (sFlt-1) is increased throughout gestation in patients who have preeclampsia develop. American Journal of Obstetrics & Gynecology, 2004, 191(4): 1240-1246.