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American Academy of Family Physicians.
American Academy of Pediatrics.
American Christmas Tree Association.
American College of Allergy, Asthma & Immunology.
American Lung Association.
Asthma and Allergy Foundation of America.
Environmental Protection Agency.
Gore, R. Journal of Allergy and Clinical Immunology , April 2003.
National Institute of Environmental Health Sciences.
National Jewish Health.
University of Illinois Extension.
University of Nebraska-Lincoln.
World Allergy Organization.
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