Surveillance and monitoring.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003258:Consumer Behavior; D003365:Costs and Cost Analysis; D003695:Delivery of Health Care; D004470:Economics, Medical; D004812:Epidemiologic Methods; D005060:Europe; D005102:Health Expenditures; D006760:Hospitalization; D006801:Humans; D007226:Infant Mortality; D007564:Japan; D008875:Middle Aged; D009017:Morbidity; D009026:Mortality; D011159:Population Surveillance; D011634:Public Health; D011639:Public Opinion; D011787:Quality of Health Care; D006113:United Kingdom; D014481:United States