Follow-up of incidence of acute upper tract diseases and influenza by means of a computer.
D003201:Computers; D003604:Czechoslovakia; D005500:Follow-Up Studies; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D008499:Medical Records; D011635:Public Health Administration; D012140:Respiratory Tract Diseases / Q000453:epidemiology*