Authors: A J Richardson; R A Frankenberg; A C Buck; J B Selkon; J S Colbourne; J W Parsons; R T Mayon-White Journal: Epidemiol Infect Date: 1991-12 Impact factor: 2.451
Authors: F J Angulo; S Tippen; D J Sharp; B J Payne; C Collier; J E Hill; T J Barrett; R M Clark; E E Geldreich; H D Donnell; D L Swerdlow Journal: Am J Public Health Date: 1997-04 Impact factor: 9.308