Authors: R W Smithells; S Sheppard; C J Schorah; M J Seller; N C Nevin; R Harris; A P Read; D W Fielding Journal: Arch Dis Child Date: 1981-12 Impact factor: 3.791
Authors: J L Mills; G G Rhoads; J L Simpson; G C Cunningham; M R Conley; M R Lassman; M E Walden; O R Depp; H J Hoffman Journal: N Engl J Med Date: 1989-08-17 Impact factor: 91.245