Epidemiology: from epidemics to the reorganization of medical care.
D002561:Cerebrovascular Disorders / Q000453:epidemiology; D004503:Education, Medical, Graduate; D004812:Epidemiologic Methods; D004813:Epidemiology / Q000193:education; D006285:Health Planning; D006801:Humans; D019966:Substance-Related Disorders / Q000453:epidemiology