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• Allergy Relief Store
• American Lung Association's page about Asthma
• Asthma UK
• Asthma and Allergy Foundation of America
• Asthma page from the (US) National Heart Blood and Lung Institute Web site
• Canadian Lung Association's page about Asthma
• Environmental Illness Resource is an information resource and interactive community site for people suffering from a range of chronic illnesses and related conditions in which environmental triggers play a significant role in producing symptoms, and the illness itself.
• Food Allergy, Intolerance, and Sensitivity a Harvard Medical School Special Health Report
• Multiple Chemical Sensitivity (MCS) Assessment, U.S. Department of Labor, Occupational Safety and Health Administration (OSHA)
• Multiple Chemical Sensitivity: Separating Facts from Fiction, Science-Based Medicine
• Food Allergy Natural Common Allergens, Chemical Allergens, E-Numbers and Food Additives [United Kingdom]