FROM THE AUG. 16, 2004 ISSUE OF TIME MAGAZINE; POSTED MONDAY, AUG. 9, 2004

Source: H. Lee Sweeney, Ph.D., University of Pennsylvania School of Medicine
TIME Graphic by Ed Gabel; TEXT by Kristina Dell

Copyright © 2003 Time Inc. All rights reserved.
Reproduction in whole or in part without permission is prohibited.

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