Authors: L Chambon; I Wone; P Brès; M Cornet; C Ly; A Michel; A Lacan; Y Robin; P Brès; B E Henderson; K H Williams; R Camain; D Lambert; M Rey; I D Mar; J L Oudart; G Causse; H Bâ; A Michel; B E Henderson; M Martin; J C Artus; K H Williams Journal: Bull World Health Organ Date: 1967 Impact factor: 9.408