Historical perspective.
Jacobs
A D
AD
D003365:Costs and Cost Analysis; D003815:Dentists / Q000706:statistics & numerical data / Q000600:supply & distribution; D004497:Education, Dental / Q000191:economics; D006801:Humans; D012575:Schools, Dental / Q000191:economics / Q000458:organization & administration*; D014481:United States / Q000453:epidemiology