Epidemiology: a moving target.
Nature.
Simon
S
Pleasants
D000755:Anemia, Sickle Cell / Q000453:epidemiology* / Q000235:genetics / Q000473:pathology / Q000628:therapy; D004912:Erythrocytes / Q000473:pathology; D063426:Human Migration / Q000706:statistics & numerical data; D006801:Humans; D008017:Life Expectancy; D008288:Malaria / Q000453:epidemiology