Progress towards global eradication of poliomyelitis, 2003 and January-April 2004.
D003140:Communicable Disease Control; D014943:Global Health; D006801:Humans; D015994:Incidence; D010264:Paraplegia / Q000453:epidemiology* / Q000517:prevention & control; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011159:Population Surveillance