NATIONAL LIBRARY OF MEDICINE
at the NATIONAL INSTITUTES OF HEALTH
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www.nlm.nih.gov
www.medlineplus.gov
Donald A.B. Lindberg, M.D.
Director, NLM
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Deputy Director, NLM
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Director, Office of Communications and Public Liaison, NLM
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Strategic Advisor, NLM
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ISSN: 1937-4712
Articles in this publication are written by professional journalists. All scientific and medical information is reviewed for accuracy by representatives of the National Institutes of Health. However, personal decisions regarding health, finance, exercise, and other matters should be made only after consultation with the reader's physician or professional advisor. Opinions expressed herein are not necessarily those of the National Library of Medicine. Photos and other images without credit lines are provided by NIH.