Authors: K J Leveno; F G Cunningham; S Nelson; M Roark; M L Williams; D Guzick; S Dowling; C R Rosenfeld; A Buckley Journal: N Engl J Med Date: 1986-09-04 Impact factor: 91.245
Authors: S D Richey; S M Ramin; R E Bawdon; S W Roberts; J Dax; J Roberts; L C Gilstrap Journal: Am J Obstet Gynecol Date: 1995-04 Impact factor: 8.661