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Institute of Medicine
National Academies Press
National Center for Biotechnology Information
American Academy of Pediatrics
Department of Radiology
Edgewood Chemical Biological Center
U.S. Department of Labor
Substance Abuse & Mental Health Services Administration (SAMHSA)
University of Washington
MedlinePlus
Merck & Co.
Bureau of Labor Statistics
eMedicine.com, Inc.
Agency for Healthcare Research & Quality
Los Angeles County
UNC Chapel Hill
Medical Center