Expanded programme on immunization. Progress towards poliomyelitis eradication, 1990-1994.
D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D006801:Humans; D007114:Immunization; D007223:Infant; D007231:Infant, Newborn; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011159:Population Surveillance; D015397:Program Evaluation