Immunization in general practice (an analysis of some of the factors involved).
D002675:Child, Preschool; D005260:Female; D006801:Humans; D007114:Immunization; D007223:Infant; D008297:Male; D011051:Poliomyelitis / Q000517:prevention & control*; D012899:Smallpox / Q000517:prevention & control*