National sickness insurance and the use of physicians' services in Finland.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000553:Ambulatory Care; D002648:Child; D005260:Female; D005387:Finland; D006306:Health Surveys; D006801:Humans; D007357:Insurance, Physician Services; D008297:Male; D008875:Middle Aged; D010820:Physicians / Q000706:statistics & numerical data; D012424:Rural Population; D012737:Sex Factors; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D014505:Urban Population