there are marked geographic variations of sspe activity within the united states and also a higher incidence for children from farms ( 9.4 per 10 million persons under 20 ) compared with children from other rural domiciles ( 3.7 per 10 million ) , suburban children ( 2.9 per 10 million ) , and inner-city children ( 1.6 per 10 million ) .
C0027361
persons
C0008059
children