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2. Risk assessment guidelines for infectious diseases transmitted on aircraft, technical report;European Centre for Disease Prevention and Control,2009
3. The airliner cabin environment and the health of passengers and crew;National research council committee on air quality in passenger cabins of commercial passenger aircraft,2002
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5. Surveillance for travel-related disease — GeoSentinel surveillance system, United States, 1997-2011;Harvey;MMWR Surveill Summ,2013