title: Expanded programme on immunization. Poliomyelitis in 1991.
mesh_terms: D014943:Global Health; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D009017:Morbidity; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D014611:Vaccination