Poliomyelitis in southern Africa.
Crawford
C L
CL
Hobbs
M J
MJ
D000353:Africa, Southern; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D011051:Poliomyelitis / Q000517:prevention & control*; D014611:Vaccination; D014944:World Health Organization