Authors: R L Sweet; J Mills; K W Hadley; E Blumenstock; J Schachter; M O Robbie; D L Draper Journal: Am J Obstet Gynecol Date: 1979-05-01 Impact factor: 8.661
Authors: J R Smith; J Murdoch; D Carrington; C E Frew; A J Dougall; H MacKinnon; D Baillie; D M Byford; C A Forrest; J A Davis Journal: BMJ Date: 1991-01-12