The New England Journal of Medicine Downloaded from nejm.org at NCSU HUNT LIBRARY on October 28, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at NCSU HUNT LIBRARY on October 28, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at NCSU HUNT LIBRARY on October 28, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at NCSU HUNT LIBRARY on October 28, 2015. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

Things are seldom what they seem.

The New England Journal of Medicine Downloaded from nejm.org at NCSU HUNT LIBRARY on October 28, 2015. For personal use only. No other uses without pe...
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