Authors: L M Marcuk; V N Nikiforov; J F Scerbak; T A Levitov; R I Kotljarova; M S Naumsina; S U Davydov; K A Monsur; M A Rahman; M A Latif; R S Northrup; R A Cash; I Hug; C R Dey; R A Phillips Journal: Bull World Health Organ Date: 1971 Impact factor: 9.408