Authors: J Eskola; H Käyhty; A K Takala; H Peltola; P R Rönnberg; E Kela; E Pekkanen; P H McVerry; P H Mäkelä Journal: N Engl J Med Date: 1990-11-15 Impact factor: 91.245
Authors: S B Black; H R Shinefield; D Lampert; B Fireman; R A Hiatt; M Polen; E Vittinghoff Journal: Pediatr Infect Dis J Date: 1991-02 Impact factor: 2.129
Authors: M Santosham; M Wolff; R Reid; M Hohenboken; M Bateman; J Goepp; M Cortese; D Sack; J Hill; W Newcomer Journal: N Engl J Med Date: 1991-06-20 Impact factor: 91.245