Authors: P Aaby; I R Pedersen; K Knudsen; M C da Silva; C H Mordhorst; N C Helm-Petersen; B S Hansen; J Thårup; A Poulsen; M Sodemann Journal: Pediatr Infect Dis J Date: 1989-04 Impact factor: 2.129
Authors: M A Koenig; M A Khan; B Wojtyniak; J D Clemens; J Chakraborty; V Fauveau; J F Phillips; J Akbar; U S Barua Journal: Bull World Health Organ Date: 1990 Impact factor: 9.408