Authors: P F Wright; R J Kim-Farley; C A de Quadros; S E Robertson; R M Scott; N A Ward; R H Henderson Journal: N Engl J Med Date: 1991-12-19 Impact factor: 91.245
Authors: R W Sutter; P A Patriarca; S Brogan; P G Malankar; M A Pallansch; O M Kew; A G Bass; S L Cochi; J P Alexander; D B Hall Journal: Lancet Date: 1991-09-21 Impact factor: 79.321
Authors: M W Otten; M S Deming; K O Jaiteh; E W Flagg; I Forgie; Y Sanyang; B Sillah; D Brogan; P Gowers Journal: Am J Epidemiol Date: 1992-02-15 Impact factor: 4.897