Editorial: Poliomyelitis in 1970.
D000349:Africa; D001210:Asia, Southeastern; D001315:Australia; D002489:Central America; D005060:Europe; D006801:Humans; D007114:Immunization; D007115:Immunization Schedule; D009656:North America; D010139:Pacific Islands; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control; D013020:South America; D014944:World Health Organization