On influenza and school closings: time for prospective studies.
Halloran
M Elizabeth
ME
D000041:Absenteeism; D000293:Adolescent; D002648:Child; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology*; D016134:Organizational Policy; D011446:Prospective Studies; D012106:Research; D012574:Schools; D014861:Washington / Q000453:epidemiology