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American Academy of Allergy, Asthma & Immunology
American College of Allergy, Asthma and Immunology
American Lung Association
American Society of Transplantation
American Thoracic Society
No Pub/Vend Assigned
American Academy of Family Physicians
Mayo Clinic
MedlinePlus
Merck & Co.
NC Health Info
Asthma & Allergy Foundation of America
National Heart Lung & Blood Institute (NHLBI)
Cold Spring Harbor Laboratory
Medical Center
Baptist Medical Center
ClinicalTrials.gov
Elsevier
National Library of Medicine (NLM)
JAMA Network
Rhode Island Medical Society
U.S. Department of Homeland Security
Center for Healthcare Strategies
Agency for Healthcare Research & Quality
Centers for Disease Control & Prevention (CDC)
Medscape
National Center for Environmental Health
Thomson Healthcare
PubMed
Wiley
UNC Healthcare
Saxe Healthcare
Society of Critical Care Medicine
OVID
New England Journal of Medicine
U.S. Department of Defense