Authors: Mary E Hannah; Walter J Hannah; Ellen D Hodnett; Beverley Chalmers; Rose Kung; Andrew Willan; Kofi Amankwah; Mary Cheng; Michael Helewa; Sheila Hewson; Saroj Saigal; Hilary Whyte; Amiram Gafni Journal: JAMA Date: 2002-04-10 Impact factor: 56.272