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NIH MedlinePlus the Magazine, Trusted Health Information from the National Institutes of Health

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NATIONAL LIBRARY OF MEDICINE
at the NATIONAL INSTITUTES OF HEALTH

8600 Rockville Pike • Bethesda, MD 20894
www.nlm.nih.gov
www.medlineplus.gov

Donald A.B. Lindberg, M.D.
Director, NLM

Betsy L. Humphreys, M.L.S., A.H.I.P.
Deputy Director, NLM

Kathleen Cravedi
Director, Office of Communications and Public Liaison, NLM

Naomi Miller, M.L.S.
Manager of Consumer Health Information, NLM

Patricia Carson
Special Assistant to the Director, NLM

Elliot Siegel, Ph.D.
Outreach Consultant, NLM

Christopher Klose
Magazine Coordinator

Peter Reinecke
Strategic Advisor, NLM

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NIH MedlinePlus Magazine Editorial Board

Donald West King, M.D.; Frank Bonner, M.D.; Joseph Perpich, M.D.; Barbara Redman, Ph.D.; William Gardner, M.D.

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Selby Bateman, Managing Editor
Jan McLean, Creative Director
Traci Marsh, Production Director

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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.

Summer 2012 Issue: Volume 7 Number 2