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A study was made to assess the proportion of 17-year-old students who consider themselves to have allergic rhinoconjunctivitis and to find out how they treat themselves. The study was performed outside the pollen season in 1993 and 1994 and 5,938 first-year secondary school students in eight different cities were asked to answer a questionnaire during class. A total of 1,458 students (24%) claimed...