Authors: S E Andrade; A M Walker; L K Gottlieb; N K Hollenberg; M A Testa; G M Saperia; R Platt Journal: N Engl J Med Date: 1995-04-27 Impact factor: 91.245
Authors: Bruce Stuart; Amy Davidoff; Ruth Lopert; Thomas Shaffer; J Samantha Shoemaker; Jennifer Lloyd Journal: Health Serv Res Date: 2011-03-17 Impact factor: 3.402