Progress towards global poliomyelitis eradication, 1999.
D019353:Endemic Diseases / Q000517:prevention & control* / Q000706:statistics & numerical data*; D014943:Global Health; D006801:Humans; D015994:Incidence; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D011159:Population Surveillance; D019984:Quality Indicators, Health Care; D014611:Vaccination