The utilization of physicians' services in Los Angeles County, 1973.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002140:California; D005260:Female; D006296:Health Services / Q000706:statistics & numerical data*; D006801:Humans; D007348:Insurance, Health; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012959:Socioeconomic Factors