The New England Journal of Medicine Downloaded from nejm.org on November 7, 2015. For personal use only. No other uses without permission. Copyright © 1990 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on November 7, 2015. For personal use only. No other uses without permission. Copyright © 1990 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on November 7, 2015. For personal use only. No other uses without permission. Copyright © 1990 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on November 7, 2015. For personal use only. No other uses without permission. Copyright © 1990 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org on November 7, 2015. For personal use only. No other uses without permission. Copyright © 1990 Massachusetts Medical Society. All rights reserved.

The new technology assessment.

The New England Journal of Medicine Downloaded from nejm.org on November 7, 2015. For personal use only. No other uses without permission. Copyright ©...
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